an economics professor gives a test to gauge the math preparedness of his students. he believes that the performance on the test and the number of hours studied are the main factors. for a group of 60 students we have what is the predicted final exam score
Answers
Answer:
hello your question is incomplete, the missing part of the question is attached below
answer :
1) β1 = 0.25
β2 = 4.85
2) 40.55 + 0.25 ( math score ) + 4.85 ( hours )
Step-by-step explanation:
1) The estimate for β1 and β2
From the attached excel result the estimates are ;
β1 = 0.25 : This shows the change in the mean value of the final score in relation to the change in math score while the time is kept constant
β2 = 4.85 : This represents the change in the mean value of the final score in relation to the change in time while the math score is held constant
2) sample regression equation
The Final sample regression equation = 40.55 + 0.25 ( math score ) + 4.85 ( hours )
Related Questions
pls help ASAP this is timing meeee!!!!
Answers
Answer:
48
Step-by-step explanation:
details will be added
A professional pool player claims that she sinks at least one ball in a pocket on 80% of her opening break shots. In a recent set of 20 games, she sunk at least one ball on her break shot in only 14 of the games. A simulation of 100 trials was conducted to see how unusual these most recent games are.
Based on the dotplot of the simulation results and the pool player’s last 20 games, which conclusion can be drawn?
The player’s true probability of sinking at least one ball on her break is 27%.
Another 100 simulated trials would show a much different outcome; therefore, we cannot draw any conclusions.
It is most likely that she would sink at least one ball during her break exactly 16 times.
There is about a 27% chance of her sinking at least one ball on her break 14 or fewer times in 20 games. This result is not unusual and there is no convincing evidence that her average is less than 80%.
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Answer: B
Step-by-step explanation:
Find the value of x in the triangle shown below.
a. x=80
b. x=48
c. x= 32
d. x=12
Answers
Answer:
solution given:
by using Pythagoras law:
h²=p²+b²
x²=8²+4²
x=√80units
Plz help this is due today AND NO LINKS OR GROSS PICTURES OR I REPORT.
Answers
Answer: D, an equilateral triangle has three congruent sides.
Answer: D
Step-by-step explanation: An equalterial triangle has 3 congruent sides!
I hope this helps! May God bless you! :)
hey I need help with my coordinates
Answers
Ok send the picture so I can help you.
Answer:
what is the question? I can help
Step-by-step explanation:
a.
Write the center and radius of a circle with the equation:
x2 + 8x + y2 - 24y + 144 = 0
center = (12,-4)
0 center = (-8,24)
radius=4
radius=12
b. center = (8,-24)
d. center = (-4,12)
radius=12
radius=4
Please select the best answer from the choices provided
Answers
Answer: The answer is D
Step-by-step explanation:
Edge 2021
Josephine has a rectangular garden with an area of 2x2 + x – 6 square feet.
Which expressions can represent the length and width of the garden?
length = x2 – 3 feet; width = 2 feet
length = 2x + 3 feet; width = x – 2 feet
length = 2x + 2 feet; width = x – 3 feet
length = 2x – 3 feet; width = x + 2 feet
Answers
Answer:
D
Step-by-step explanation:
A vehicle moves along a straight road. The vehicle's position is given by f(t) , where tt is measured in seconds since the vehicle starts moving. During the first 10 seconds of the motion, the vehicle's acceleration is proportional to the cube root of the time since the start. Which of the following differential equations describes this relationship, where k is a positive constant?
a. df/dt = kſ
b. df/dt - = kgf
c. d²f/dt = kyt dt2
d. d²f/dt = ky
Answers
Answer:
Step-by-step explanation:
a
or D
having trouble i don't understand the problem
Answers
Answer:
1
a= 25/36
b= -1
c= -8/15
2
a=positive
b=negative
c=positive
d=positive
hope it helps
How can you Divide the number 30 into 4 equal parts? Or can you?
Answers
Answer:
7.5
Step-by-step explanation:
thirty divided by 4 is 7.5 or 7 1/2
Answer:
That might be possible though.
Step-by-step explanation:
If you divide 30 by 7.5, you'll get 4. With any other number, you'll get 3,10,6,5,1, and 30. If you use a decimal, it might be possible it'll give you the answer you wanted.
The table shows Kayden's quiz scores for a semester. What are the mean and the standard deviation, rounded to the nearest hundredth, for the quiz data?
45 48 42 47 43
Mean =
Standard deviation =
Answers
Answer:
The mean is of 45.
The standard deviation is 2.28.
Step-by-step explanation:
The mean is the sum of all values divided by the number of values.
The standard deviation is the square root of the sum of the difference squared between each value and the mean, and divided by the number of values.
Mean:
[tex]M = \frac{45 + 48 + 42 + 47 + 43}{5} = 45[/tex]
The mean is of 45.
Standard deviation:
[tex]M = \sqrt{\frac{(45-45)^2 + (48-45)^2 + (42-45)^2 + (47-45)^2 + (43-45)^2}{5}} = 2.28[/tex]
The standard deviation is 2.28.
7. What is the area of a triangle whose base is 14 cm and a height of 12 cm?
Answers
Answer:
84 cm²
Step-by-step explanation:
1/2x14x12=84
Please help! I need help ASAP and the question is in the picture. I’m giving 35 points! PLEASE HELP ASAP
Answers
Answer:
36x
Step-by-step explanation:
I believe this should be the answer. I hope it helps.
HELP ASP!!!! PLS?!!!!! #15
Answers
Answer:
you need the farmula lol lol lol lol lol lol lol
Step-by-step explanation:
a machine shop has a fixed cost of $2000 to produce new bolts. The cost of materials and labor to produce each individual bolt is $8.50. Which of the following functions models the average cost per bolt for the company to produce x bolts, where
x>1?
Answers
Answer:
(8.50x + 2000)/x and x>1
Step-by-step explanation:
Well, this may not be the exact answer, as it seems you have the choices unlisted--if they even exist at all. But, I'll make do with what I've provided, so
In the question, it says the collective cost for each individual bolt is $8.50, and that we can use the variable x to represent the number of bolts the company wishes to produce. So, this can be shown using 8.50x.
The fixed cost is set in stone, so no alterations need to be applied, and only cause the total to amount to a greater number. So, we end up with (8.50x + 2000)/x and x>1 is the rule for the values of x. Essentially, all that means is that the company will always produce more than one bolt.
What is the domain of (-2, 5), (8, 6), (3, 12) (2, 6)
Answers
Answer:
The domain is (-2, 8, 3, 2)
Step-by-step explanation:
The domain is such because domain is the x-element or the one you see at first in the ordered pairs.
last step
merical simplification until the
1
Exercise 19c
Use the value 27 for n in this exercise.
Calculate the volume of a cylindrical steel
bar which is 8 cm long and 3.5 cm in
diameter.
2 The tank on a petrol lorry is a cylinder 2 m
in diameter and 7 m long.
a
Calculate its volume in m?.
b Find its capacity in kilolitres.
Answers
Answer:
77 cm^3
22 m^3
22 kl^3
Step-by-step explanation:
volume of a cylinder = nr^2h
n = 22/7
r = radius
the diameter is the straight line that passes through the centre of a circle and touches the two edges of the circle.
A radius is half of the diameter
1. Radius = 3.5 / 2 = 1.75
Volume = (22/7) x (8) x 1.75^2 = 77 cm^3
2. radius = 2/2 = 1m
Volume = (22/7) x (7) x 1^2 = 22 cm^3
1 meter = 1 kilolitre
capacity = volume
capacity = 22 kl^3
4.3x10^3 in standard notation
Answers
Answer:
4300
Step-by-step explanation:
i think this is what you want
What is the unit rate for this table? Please help!!!
Answers
Solve the following pair of simultaneous equation using elimination method.
3x_2y=7
X+2y= _3
Answers
Answer:
x = 1 and y = −2
Step-by-step explanation:
Rewrite equations:
x + 2y = −3
3x − 2y = 7
Step 1: Solve x+2y=−3 for x:
x + 2y = −3
x + 2y + −2y = −3 + −2y (Add -2y to both sides)
x = −2y − 3
Step 2: Substitute −2y − 3 for x in 3x − 2y = 7:
3x − 2y = 7
3(−2y − 3) − 2y = 7
−8y − 9 = 7 (Simplify both sides of the equation)
−8y − 9 + 9 = 7 + 9 (Add 9 to both sides)
−8y = 16
−8y/−8 = 16/−8 (Divide both sides by -8)
y = −2
Step 3: Substitute −2 for y in x = −2y − 3:
x = −2y − 3
x = (−2)(−2) − 3
x = 1 (Simplify both sides of the equation)
This is for 20 points 0.4 Divided by 29
Answers
Answer:
72.500
Step-by-step explanation:
I'm not sure, but I'm 80% sure
someone plz help i will give brainliest (no links)
Answers
Answer:
for part b the answer is 90 degrees
Step-by-step explanation:
2 is adjacent from 5 so they are the same degree number
Solve
FIND THE SIMPLE INTEREST WHEN PRINCIPAL= $300, rate = 8%
Time= 4 years
WILL GIVE BRAINLIST
X
X
X
X
X
X
X
X
X
X
X
Answers
P( 1+rt)
300( 1+ (8X4)
Answer:
408.14
Step-by-step explanation:
The equation would be 300(1.08)^4, this is because when finding interest you use the formula principal(1+%)^time
What is the probability of choosing a red card from a deck of cards? Type your answer as a fraction.
Answers
Answer:
26/52 or 1/2
Step-by-step explanation:
There are 1-9, King, Queen, Jack, for both Diamonds and Hearts
If A = (-2,-4) and B = (-8,4), what is the length of AE?
A. 12 units
B. 16 units
C. 10 units
D. 14 units
Answers
Answer:
It's C
Step-by-step explanation: How far is it from -2 to -8 horizontally?
They are 6 apart, right?
How far is -4 to 4 vertically? 8.
__________________________________________________________
6^2 + 8^2 = c^2
36 + 64 = c^2
c = 100 = 10
___________________________________________________________
So in short yea...it's C UwU
If 21 is added to a number, the result is 41 less than twice the number. Find the number.
Answers
Answer: 62
Step-by-step explanation: Set up your equation
21+x=2x-41 because the number (x) that 21 is added to is 41 less than (so subtraction) twice (so multiply the number x by 2) the number (x).Get the x's on one side by subtracting the single x21=x-41Now add 41 to both sides to completely isolate x62=xSo, your answer is x=62. The number is 62.Check your work. 62+21=83. 2(62)= 124. 124-41=83. Both equations equal 83, so the solution is correct.
In a class test (+ 5) marks are given for every correct answer and (–2) marks are given for every incorrect answer and no marks for not attempting any question.
(i) Rayan scored 30 marks. If she has got 10 correct answers, how many questions has she attempted incorrectly?
(ii) Riya scores 44 marks by attempting 13 questions. How many questions has he attempted correctly and how many has he attempted incorrectly?
Answers
OK ITS OK IM GOD CALM DOWN
Answer:
Step-by-step explanation:
(1)
If she got 10 answers right, she got 5 * 10 = 50 marks before anything was deducted.
Since she wound up with 30 marks, she lost 50 - 30 = 20 marks. If you don't feel comfortable with this, call it -20
Each incorrect answer cost her -2 marks.
Divide -20 /-2 = 10
She has answered 10 questions incorrectly.
(ii)
5x - 2y = 44
x + y = 13 Multiply this equation by 2
2x + 2y = 26
Rewrite the first and third equations
5x - 2y = 44
2x + 2y = 26 Add
7x = 70 Divide by 7
x = 70/7
x = 10
So 10 questions were answered correctly
x + y = 13
10 + y = 13
y = 3
Answer
10 were answered correctly
3 were answered incorrectly
I NEED HELP jimthompson5910
15. The price of a coat was reduced from $150 to $90. By what percentage was the price reduced?
16. Nate’s hourly pay rate was raised from $10 to $12. By what percentage was Nate’s pay raised?
17. A tree grew from a height of 8 feet to a height of 12 feet. By what percentage did the tree’s height increase?
18. This week only, the local coffee shop is reducing the price of a cup of coffee from $3 .00 to $2 .28. By what percentage is the price reduced?
19. On a sunny day, the area of a puddle decreased from 700 square inches to 560 square inches. By what percentage did the area decrease?
20. A baker increased the amount of chocolate in a recipe from 8 ounces to14 ounces. By what percentage was the amount of chocolate increased?
The price of an $8,000 car is temporarily reduced to $5,000. By what percentage is the price reduced?
22. Zoe needs to raise the reduced price of the car to its original price. By what percentage should she raise the reduced price?
Answers
16. 20%
17. 50%
18.24%
19. 20%
20. 75%
21. 37.5%
22. 60%
I'll do the first four problems to get you started
====================================================
Problem 15
Answer: 40%-----------------
Explanation:
The price dropped by $60, since 150-90 = 60. This is the discount, which is the amount you save. Divide this over the original price ($150) and we get 60/150 = 0.40 = 40%
Therefore, the price has been reduced by 40%. If we take 40% of 150, then 0.40*150 = 60 showing that 40% of $150 is 60 dollars. This matches up with the discount value mentioned earlier. So it helps verify the answer.
====================================================
Problem 16
Answer: 20%-----------------
Explanation:
The pay raised by 12-10 = 2 dollars. So the percent increase is 2/10 = 0.20 = 20%
Note how 20% of 10 = 0.20*10 = 2 is the pay raise amount; meaning that 2 is 20% of 10.
====================================================
Problem 17
Answer: 50%-----------------
Explanation:
I'll use a formula this time, but we could follow the same idea as the previous problems. This is to give another approach.
A = old value = 8
B = new value = 12
C = percent change
C = [ (B-A)/A ] * 100%
C = [ (12-8)/8 ] * 100%
C = (4/8)*100%
C = 0.50*100%
C = 50%
50% is the same as half of the value. Note how half of 8 is 4, ie 50% of 8 = 0.50*8 = 4. So this is the amount of increase when going from 8 to 12.
Side note: The "B-A" portion in the numerator represents the change in value. We divide this change over the original amount "A" and then multiply by 100% to get the percent change we're after.
====================================================
Problem 18
Answer: 24%-----------------
Explanation:
I'll use the formula again
A = old value = 3.00
B = new value = 2.28
C = percent change
C = [ (B-A)/A ] * 100%
C = [ (2.28-3.00)/3.00 ] * 100%
C = (-0.72/3.00)*100%
C = -0.24*100
C = -24%
The negative percent change means we have a percent decrease. So we have a 24% decrease. Since your teacher is asking about how much the percent reduction is, we'll write the positive version of this percentage.
Problems 19 through 22 will follow the same ideas as shown in the previous problems.
plsss help me and fast
Answers
Answer:
234 Square Inches
Step by Step Explanation:
To find the area of a parallelogram, we must first find the height. In this case, it is 18. Then, we must find the base. In this case, it is 13. Then, we multiply base x height for our final answer of 234.
Base - 13
Height - 18
18 x 13 = 234.
Easy enough?
HELP ME PLSSSS
Heights of Males (in inches)
The heights of eight males in inches were used to make the box plot shown above. Which of the following is the median of the set of heights?
A. 69
B. 75.5
C. 73
D. 73.5
brainliest, extra points.
i understand if u need points , so u can go to my old questions and answer.
pls only answer if your for sure it's correct!
Answers
The median is usually notated by the line in the rectangle. The median means that half of the numbers are larger than that number, and half smaller.
Answer: The answer is 73.5 100000%
Step-by-step explanation: i took the test