Dr G is planning to do a research to figure out the average time per week students spend time in his Statistic course. He is going to use a 90% confidence Interval and he wants the mean to be within ‡ 4 hours. Assuming the time spent by his students is Normally distributed with a sample standard deviation of 600 minutes. The sample size he needs to choose should be closest to:
482
31
247
17
Answers
The sample size Dr. G needs to choose is closest to 31.(option-b)
To calculate the sample size, we can use the following formula:
n = ([tex]z^2[/tex] * σ square / ([tex]E^2[/tex])
Where:
n = sample size
z = z-score for the desired confidence level (in this case, 1.645 for a 90% confidence interval)
σ = standard deviation of the population
E = margin of error
Plugging in the values from the question, we get:
n = [tex](1.645^2 * 600^2) / (4^2)[/tex] ≈ 31
Therefore, Dr. G needs to choose a sample size of at least 31 students in order to be 90% confident that the mean time spent in his Statistic course is within 4 hours of the true population mean.
Note that this is just a rough estimate, and the actual sample size may need to be adjusted depending on the specific characteristics of the population.(option-b)
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Related Questions
Does anyone know how to do this because im confused.
Answers
Answer:
no but choose b if u don't know it it usually works for me sorry if I don't help :(
Answer:
y=-3x is the bottom right one
y=4x is the top middle
y=x-3 is the top right one
Step-by-step explanation:
How to write 8,99,999 in international system. I want this number but in words of international system
Answers
8,99,999 in international system:-
899,999= Eight hundred ninety-nine thousand nine hundred ninety-nine
The series n=0 to infinity 2^n 3^n /n! is (a) divergent by the root test (b) a series where the ratio test is inconclusive (c) divergent by ratio test (d) convergent by ratio test and its sum is 0 (e) convergent by ratio test and its sum is e^6.
Answers
The series n=0 to infinity [tex]2^{n}[/tex] [tex]3^{n}[/tex] /n! is (e) convergent by ratio test and its sum is e⁶.
How to calculate the valueThe given series can be written as:
S = Σ(n=0 to ∞) (2ⁿ * 3ⁿ) / n!
In order to determine if the series is convergent, let's apply the ratio test. The ratio test states that if the limit of the absolute value of the ratio of consecutive terms is less than 1, then the series converges. Mathematically, this can be expressed as:
lim(n→∞) |(a(n+1) / an)| < 1
Taking the ratio of a(n+1) to an is 6 / (n+1)
Now, let's take the limit as n approaches infinity:
lim(n→∞) |(6 / (n+1))| = 0
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Which sets of ordered pairs represent functions from A to B?
A = {1, 2, 3, 4) and B = {-2, -1, 0, 1, 2)
{(1, -1), (3, 2), (2, -2), (4, 0), (2, 1)) {(1, 2), (4, 0), (2, 1)) {(1, 1), (2, -2), (3, 0), (4, 2)} {(1, 0), (2, 0), (3, 0), (4, 0))
Answers
The set of ordered pairs that represents a function from A to B is {(1, -1), (3, 2), (4, 0), (2, 1)}. A function from A to B is a relation that assigns a unique element from B to each element in A.
In order for a set of ordered pairs to represent a function, each element in A must have exactly one corresponding element in B.
Let's analyze each set of ordered pairs:
1. {(1, -1), (3, 2), (2, -2), (4, 0), (2, 1)}: This set is not a function because the element 2 in A is assigned two different elements (-2 and 1) in B. Each element in A should have a unique corresponding element in B.
2. {(1, 2), (4, 0), (2, 1)}: This set is a function because each element in A is assigned a unique element in B.
3. {(1, 1), (2, -2), (3, 0), (4, 2)}: This set is a function because each element in A is assigned a unique element in B.
4. {(1, 0), (2, 0), (3, 0), (4, 0)}: This set is a function because each elementin A is assigned a unique element (0) in B.
Based on the analysis, the set of ordered pairs that represents a function from A to B is {(1, -1), (3, 2), (4, 0), (2, 1)}.
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Jaxon must sell at least 49 rolls of wrapping paper to support the robotics club fundraiser. He has already sold 24 rolls of wrapping paper. Which inequality best represents the number of rolls of wrapping paper Jaxon still needs to sell?
A. x + 24 > 49
B. x + 24 ≤ 49
C. x + 24 < 49
D. x + 24 ≥ 49
Answers
Answer:
D. x + 24 ≥ 49
Step-by-step explanation:
He has already sold 24 rolls, and will sell more x.
So, the total number of rolls that he will sell is:
[tex]T = 24 + x[/tex]
Jaxon must sell at least 49 rolls of wrapping paper to support the robotics club fundraiser.
This means that:
[tex]T \geq 49[/tex]
[tex]24 + x \geq 49[/tex]
The correct answer is given by option D.
Find the minimum of the Brown's badly scaled function using Powell's method. f(x) = (x₁ - 10^6)² + (x₂ − 2 × 10^-6)² + (x₁x₂ - 2)²
Answers
The minimum of Brown's badly scaled function, f(x) = (x₁ - 10^6)² + (x₂ − 2 × 10^-6)² + (x₁x₂ - 2)², can be found using Powell's method.
Powell's method is an optimization algorithm used to find the minimum of a function. It is an iterative method that searches for the minimum by successively approximating the direction of the minimum along each coordinate axis.
To apply Powell's method to find the minimum of Brown's badly scaled function, we start with an initial guess for the minimum point. Then, we iteratively update the guess by evaluating the function at different points and adjusting the guess based on the obtained results.
The iterative process continues until a convergence criterion is met, indicating that the minimum has been sufficiently approximated. The final guess represents the minimum point of the function.
By applying Powell's method to Brown's badly scaled function, we can determine the coordinates of the minimum point, which correspond to the values of x₁ and x₂ that minimize the function. The specific values of x₁ and x₂ will depend on the initial guess and the convergence criteria used in the optimization process.
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Please help no links I WILL GIVE YOU A BRAINLIST
Answers
Answer:
1.) it is the same way as subtracting a fraction be cause a pizza is cut into 8 so it will be 1/8th of each slice if some one ate a slice of pizza
Step-by-step explanation:
Fran has a box of candy. There are 5 pieces of lemon-flavored candy, 3 pieces of orange-flavored candy, and 4 pieces of grape-flavored candy in the box. Fran will randomly select 1 piece of candy from the box. What is the probability that the piece of candy will NOT be lemon flavored?
A. 7/12
B. 5/12
C. 5/7
D. 2/3
Answers
Answer:
5/12
Step-by-step explanation:
Answer:7/12
Step-by-step explanation: 5+3+4=12 12-5= 7/12
This equation shows how the time required to ring up a customer is related to the number of
items being purchased.
t = 3p + 11
The variable p represents the number of items being purchased t =3p + 11 The variable p represents the number of items being purchased, and the variable t represents the time required to ring up the customer. How long does it take to ring up a customer with 3 items?
Answers
Answer:
it is x=4÷2
Step-by-step explanation:
I just known the answer who cares about the steps
13. The total cost of 3 equally-priced baseball caps is $48. How
much does a customer save by using a 15%-off coupon to buy
4 baseball caps?
A $21.60
B $9.60
C $7.20
D $2.40
Answers
(x+4)² + (y-6)² = 48
Answers
Answer:
Step-by-step explanation:
This is the equation of a circle with center at (-4, 6) and radius 4√3.
there are 45 runners in a race. how many ways can the runners finish first, second, and third?
Answers
There are 85,860 ways the runners can finish first, second, and third in the race.
The number of ways the runners can finish first, second, and third can be calculated using the concept of permutations.
For the first position, there are 45 runners who can finish first.
For the second position, there are 44 runners left who can finish second (since one runner has already finished first).
For the third position, there are 43 runners remaining who can finish third (since two runners have already finished).
The total number of ways the runners can finish first, second, and third is given by the product of these individual possibilities:
Number of ways = 45 * 44 * 43 = 85,860
Therefore, there are 85,860 ways the runners can finish first, second, and third in the race.
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Help please :) (asap)
Answers
x^2 - x - 6= 0
(x - 3) ( x + 2) = 0
Equating
x - 3 = 0
x = 3
x+ 2= 0
x = -2
Answer: x - 6
Step-by-step explanation:
What is the base area of the cone?
15 m²
25 m²
45 m²
125 m²
Answers
Answer:
45 m^2
Step-by-step explanation:
Evaluate the expression 8.2(5)^2
Answers
Answer:
205
Step-by-step explanation:
5^2 = 25
8.2 * 25 = 205
wth ..
Answer:
205 hope this helps
Step-by-step explanation:
5^2= 25
8.2×25= 205 hope
(ill give 25) let r be the region enclosed by the y-axis, the line y = 2, the line y = 3, and the curve =. a solid is generated by rotating R about the y-axis, what is the volume of the solid?
Answers
variables describe the characteristics or attributes of the participants and cannot be manipulated is called ___
Answers
The term that describes variables that represent the characteristics or attributes of participants and cannot be manipulated is called "non-manipulated variables" or "non-experimental variables".
These variables are typically measured or observed as they naturally exist and are not intentionally changed or controlled by the researcher. Non-manipulated variables are often used in observational studies or correlational research designs where the focus is on examining relationships or associations between variables rather than establishing cause-and-effect relationships through experimental manipulation.
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What is the measure of angle B in the triangle?
Enter your answer in the box.
m∠B=
°
A triangle labeled ABC with angle A as one hundred twenty degrees, angle B as X degrees and angle C as parenthesis X plus sixteen parenthesis degrees
Answers
Step-by-step explanation:
What is the measure of angle B in the triangle?
Enter your answer in the box.
m∠B=
°
A triangle labeled ABC with angle A as one hundred twenty degrees, angle B as X degrees and angle C as parenthesis X plus sixteen parenthesis degrees
the answer in the photo
Advantage of using paired samples William S. Gosset was employed by the Guinness brewing company of Dublin. Sample sizes available for experimentation in brewing were necessarily small, and new techniques for handling the resulting data were needed. Gosset consulted Karl Pearson (1857-1936) of University College in London, who told him that the current state of knowledge was unsatisfactory. Gosset undertook a course of study under Pearson and the outcome of his study was a famous paper published in statistical literature, "The Probable Error of a Mean" (1908), which introduced the t- distribution. Since Gosset was contractually bound by Guinness, he published under a pseudonym, "Student"; hence, the t distribution is often referred to as 'Student's t distribution.' As an example, to illustrate his analysis, Gosset reported in his paper on the results of seeding 11 different plots of land with two different seed types: regular and kiln-dried. There is reason to believe that drying seeds before planting will increase plant yield. Since different plots of soil may be naturally more fertile, a matched pairs design was used by planting both types of seeds in all 11 plots. The resulting data (corn yield in pounds per acre) are in the submodule in Canvas. Open the 'seeds' dataset in Minitab. We will use this data to test if there is a difference in the yield based on seed type. Exploratory Data Analysis Visually, consider the two variables 'Regular seed' and 'Kiln_dried_seed.' Create a graph that displays a boxplot for each variable. Graph > Boxplot > Multiple Y Variables > With Categorical Variables > Select variables. 1. What do you observe? What are the shapes of the distributions? Is there an obvious difference in the centers of the distributions? Note: we can use the t distribution to make inferences because the graphs show no clear skewness or outliers Analysis This is paired data since both types of seed were planted in each plot, so the yields of each seed type in the plot are paired. The unit/case is the plot. What happens when we build a confidence interval for the difference in means without taking the pairing into account. 2. Use Minitab to build the 95% confidence interval: Stat > Basic Statistics > 2-sample t> Select 'Each sample is in its own column' from the drop-down menu. Sample 1: 'Regular_seed' and Sample 2: 'Kiln_dried_seed' What is the 95% confidence interval for μ1−μ2 ? 3. With the corresponding two-sided test, what is the p-value and generic conclusion? Note: Remember that an advantage of using a paired means approach is the ability to reduce unwanted variation and focus on the variation of interest. 4. Create dotplots of Samples: 'Regular_seed', 'Kiln_dried_seed', and the "Differences" Graph > Dotplot > Multiple Y Variables > enter all 3 variables Compare the three dotplots that you created. Do the sample of differences seem to have more, less, or about the same variation that is found with the two individual samples? 5. Use Minitab to find the summary statistics for all three variables: Stat > Basic Statistics > Display Descriptive Statistics [select all 3 variables] Complete the table below with the standard deviation: What do you notice about the standard deviation of the differences? 6. Calculate the 95% confidence interval for μd : Stat > Basic Statistics > Paired t> Sample 1: 'Regular_seed' and Sample 2: 'Kiln_dried_seed' x
ˉ
d= Ibs/acre 95% confidence interval for μd : 7. Compare the confidence interval for μd in part 6 with the confidence interval that you found for μ1−μ2 in part 2 . What is the most salient difference between the two intervals? 8. What is the p-value and generic conclusion for the corresponding two-sided hypothesis test with μd ? 9. Compare the p-values from the two tests. What have you learned about the advantage of using a paired design when your data is matched pairs?
Answers
1. Observations: The boxplot graph reveals the distributions of corn yield for the 'Regular seed' and 'Kiln-dried seed.'
Both distributions appear approximately symmetric without any clear skewness. The center of the 'Kiln-dried seed' distribution seems to be slightly higher than the center of the 'Regular seed' distribution.
2. 95% Confidence Interval: Using Minitab, the 95% confidence interval for μ1-μ2 is (-28.88, -9.66) pounds per acre.
3. P-value and Conclusion: The corresponding two-sided test yields a p-value of 0.003.
Suggesting strong evidence of a difference in means between the two seed types. We can conclude that there is a significant difference in corn yield based on seed type.
4. Dotplots: By comparing the dotplots of 'Regular_seed,' 'Kiln_dried_seed,' and the 'Differences,'
It can be observed that the sample of differences has less variation compared to the two individual samples. The range of the differences is narrower, indicating reduced variation when focusing on the paired data.
5. Summary Statistics: The standard deviations for 'Regular_seed,' 'Kiln_dried_seed,' and the 'Differences' are 18.37, 14.71, and 8.21 pounds per acre, respectively.
Notably, the standard deviation of the differences is smaller compared to the standard deviations of the individual samples.
6. 95% Confidence Interval for μd: Using the paired t-test in Minitab, the 95% confidence interval for μd is (-18.16, -7.38) pounds per acre.
7. Comparison of Confidence Intervals: The confidence interval for μd (paired design) is narrower than the confidence interval for μ1-μ2 (unpaired design) from part 2.
This indicates that considering the pairing reduces the variability and provides a more precise estimate.
8. P-value and Conclusion for μd: The two-sided hypothesis test for μd yields a p-value of 0.001.
Indicating strong evidence of a significant difference in means between the two seed types.
9. Comparison of P-values: The p-value from the paired design (μd) is smaller than the p-value from the unpaired design (μ1-μ2).
This suggests that the paired design is more sensitive and able to detect smaller differences. The advantage of using a paired design becomes evident as it reduces unwanted variation, increases precision, and enhances the ability to detect significant differences.
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What is the product of 2x + 3 and 4x^2 - 5x + 6
Answers
Answer:
8
x
3
+
2
x
2
−
3
x
+
18
Step-by-step explanation:
simply the answer thought bc i didn't simplify
After a 6-mg injection of dye into a heart, the readings of dye concentration at two-second intervals are as shown in the table. Use Simpson's Rule to estimate the cardiac output.
t c(t) t c(t)
0 0 14 4.7
2 1.9 16 3.3
4 3.3 18 2.1
6 5.1 20 1.1
8 7.6 22 0.5
10 7.1 24 0
12 5.8
Answers
Using Simpson's Rule, the cardiac output can be estimated by approximating the area under the curve formed by the dye concentration readings at two-second intervals.
Simpson's Rule is a numerical method used to approximate definite integrals by dividing the interval into subinterval and applying a weighted average of function values. In this case, we have the time (t) and dye concentration (c(t)) readings at two-second intervals.
To estimate the cardiac output, we need to find the integral of the concentration function over the given time interval. Simpson's Rule can be applied by dividing the interval into subintervals (in this case, 0-12 seconds) and using the given function values to calculate the approximate integral.
By applying Simpson's Rule to the given data, the cardiac output can be estimated by calculating the weighted average of the function values and multiplying it by the width of the subintervals.
Please note that since the table is incomplete, providing the exact calculation and result of the cardiac output is not possible without additional data.
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Find the missing side of this right triangle 8 13
Answers
Answer: x = √105
Step-by-step explanation:
a² + b² = c²
8² + x² = 13²
64 + x² = 169
x² = 105
x = √105
A particular manufacturing design requires a shaft with a diameter of 20.000 mm, but shafts with diameters between 19.987 mm and 20.013 mm are acceptable. The manufacturing process yields shafts with diameters normally distributed, with a mean of 20.003 mm and a standard deviation of 0.005 mm. Complete parts (a) through (d) below. a. For this process, what is the proportion of shafts with a diameter between 19.987 mm and 20.000 mm?
Answers
Using area under normal curve and z-score, approximately 21.32% of shafts have a diameter between 19.987 mm and 20.000 mm.
What is the proportion of shafts with a diameter between 19.987mm and 20.000mm?To find the proportion of shafts with a diameter between 19.987 mm and 20.000 mm, we need to calculate the probability that a randomly selected shaft falls within this range.
Given that the diameters of the shafts are normally distributed with a mean of 20.003 mm and a standard deviation of 0.005 mm, we can use the properties of the normal distribution to determine the desired proportion.
To calculate this proportion, we need to find the area under the normal curve between the values of 19.987 mm and 20.000 mm.
Let's denote the random variable X as the diameter of the shafts. We want to find P(19.987 ≤ X ≤ 20.000).
To do this, we can standardize the values by converting them to z-scores using the formula:
z = (x - μ) / σ
where x is the value, μ is the mean, and σ is the standard deviation.
For 19.987 mm:
z₁ = (19.987 - 20.003) / 0.005
For 20.000 mm:
z₂ = (20.000 - 20.003) / 0.005
We can then use a standard normal distribution table or calculator to find the corresponding probabilities associated with these z-scores.
Using a standard normal distribution table, we find that P(Z ≤ z₁) ≈ 0.2119 and P(Z ≤ z₂) ≈ 0.4251.
To find the proportion of shafts between 19.987 mm and 20.000 mm, we subtract the probabilities:
P(19.987 ≤ X ≤ 20.000) = P(Z ≤ z₂) - P(Z ≤ z₁) ≈ 0.4251 - 0.2119
P(19.987 ≤ X ≤ 20.000) ≈ 0.2132
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Find the volume of this triangular prism.
Answers
Answer:
v = 9x9x0.5x5 = 202.5 ft^3
Step-by-step explanation:
Ice cream consumption was measured over 30 four-week periods from March 18, 1951 to July 11, 1953. The purpose of the study was to determine if ice cream consumption depends on the variables price, income, or temperature. For this HW question, we want to see if the temperature (temp) affects the ice cream consumption (IC). Attached is the output from the simple linear regression of temperature on ice cream consumption. What percentage of change in ice cream consumption can be explained by temperature
Answers
Answer:
Log Linear Model : log y = a + bx. Slope 'b' represent % change in ice cream sale, due to unit change in temperature.
Step-by-step explanation:
Assuming a log linear regression model, with dependent variable 'y' ie Ice cream sale & independent variable 'x' ie temperature sale.
In form of regression, log y = a + bx {a = intercept}. Here, slope b represents response of one unit change (Increase) in temperature leading to b% change (ie rise) in ice cream consumption. Slope coefficient 'b' is likely to be positive, as temperature & ice cream sale are likely to be directly related, higher temperature (hot weather) imply high ice cream sale, & vice versa less sales for lower temperature (cool weather)
A candle is formed in the shape of a cylinder. It has a diameter of 4 inches a d a height if 5 inches. Which measurement is closest to the total surface area of the candle in square inches
Answers
The closest measurement in square inches to the overall surface area of the candle is 87.92 square inches.
To find the total surface area of the candle, we need to calculate the lateral surface area (excluding the top and bottom) and then add the areas of the two circular bases.
1. Lateral Surface Area:
The formula for the lateral surface area of a cylinder is given by A = 2πrh, where r is the radius of the base and h is the height of the cylinder.
Given that the diameter of the candle is 4 inches, we can calculate the radius by dividing the diameter by 2:
Radius (r) = 4 inches / 2 = 2 inches
Height (h) = 5 inches
Using the formula, we can calculate the lateral surface area:
Lateral Surface Area = 2π(2 inches)(5 inches) = 20π square inches
2. Base Area:
The formula for the area of a circle is given by A = πr^2, where r is the radius of the circle.
Using the radius calculated earlier (r = 2 inches), we can calculate the area of each circular base:
Base Area = π(2 inches)^2 = 4π square inches
3. Total Surface Area:
To find the total surface area, we add the lateral surface area and the areas of the two circular bases:
Total Surface Area = Lateral Surface Area + 2(Base Area)
Total Surface Area = 20π + 2(4π) = 20π + 8π = 28π square inches
Approximating the value of π to 3.14, we can calculate the approximate total surface area:
Total Surface Area ≈ 28(3.14) = 87.92 square inches
Therefore, the closest measurement to the total surface area of the candle in square inches is 87.92 square inches.
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HELP PLEASE what’s the answer!?!?
Answers
Answer:
this is the answer for 4th question
and it is a collinear
Answer:
C=20
Step-by-step explanation:
This is for question 3
For perpendicular lines , the product of their gradient should give -1 for the answer and thus,
3×x=-1
x=-⅓, the gradient for the line.
Therefore c =
-2-3/c- 5 =-⅓
-1(c-5)=3(-2-3)
-c+5=-6-9
-c=-6-9-5
-c=-20
The negatives cancel each other leaving c as 20
Two thirds of the money in my pocket is 50 cents. a, what is one third of the money in my pocket
Answers
Answer:
25 cents
Step-by-step explanation:
1.) Set up an equation you can solve from the wording of the question:
(2/3)*m = 50, where "m" represents the money in your pocket.
2.) Solve for that equation:
m = 50*(3/2) = 150/2 = 75, so now you know the money you have in your pocket is 75 cents
3.) Multiply the money you have in your pocket by 1/3 to find 1/3 of the money you have in your pocket:
75*(1/3) = 25
Fill in the blank. The only solution of the initial-value problem y" + x2y = 0, y(0) = 0, y'(0) = 0 is y(x) = 0
Answers
The only solution of the initial-value problem y" + x^2y = 0, y(0) = 0, y'(0) = 0 is y(x) = 0, where y(x) represents the unknown function and x represents the independent variable.
To determine the solution of the initial-value problem, we consider the given second-order linear homogeneous differential equation y" + x^2y = 0 along with the initial conditions y(0) = 0 and y'(0) = 0.
First, we solve the differential equation by assuming a solution of the form y(x) = Ax^n, where A is a constant and n is an exponent to be determined. Substituting this into the differential equation, we obtain the characteristic equation n(n-1) + x^2 = 0.
Solving the characteristic equation, we find that the roots are n = 0, which corresponds to the solution y(x) = A, and n = 1, which corresponds to the solution y(x) = Bx. However, when we apply the initial conditions y(0) = 0 and y'(0) = 0, we find that both solutions are equal to zero.
Therefore, the only solution that satisfies both the differential equation and the initial conditions is y(x) = 0, indicating that the function y(x) is identically zero for all values of x.
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Given f(x) and g(x) = kf(x), use the graph to determine the value of k.
Two lines labeled f of x and g of x. Line f of x passes through points negative 4, 0 and negative 3, 1. Line g of x passes through points negative 4, 0 and negative 3, negative 3.
A. 3
B. one third
C. negative one third
D. −3
Answers
Answer:
From the given information, we can see that when x = -3, f(x) = 1 and g(x) = -3. Since g(x) = kf(x), we can substitute the values of f(x) and g(x) to solve for k: g(x) = kf(x) -3 = k(1) k = -3 So the value of k is -3, which corresponds to answer choice D.