Question 15

Joseph is looking for a 27 inch computer monitor. He finds that this size of computer monitor costs on average $230 with a standard deviation of $35, and the distribution of prices follows a Normal distribution.

What is the probability that a randomly chosen monitor will have a price below $200?Answer as a probability (between 0 and 1) to four decimal places.

Question 16

While Cleo is working the cash register at a grocery store, she notices that 62% of customers use the one-hour of free parking for store customers (customers bring their parking ticket into the store and then the store gives them $2 off their purchase). Assume that customers are independent of each other, and Cleo checks out 150 customers.

What is the expected value for the number of customers who will use the parking?

Expected value = Answer to two decimal places as needed.

What is the standard deviation for the distribution of number of customers who will use the parking?

SD = Answer to two decimal places as needed.

Question 17

Which of the following are valid probability models for discrete random variables? Select all that apply.

Group of answer choices

Probability Model A

x	0	1	2	3
P(x)	0.1	0.3	0.3	0.2

Probability Model B

x	-2	-1	0
P(x)	0.25	0.5	0.25

Probability Model C

x	W	X	Y	Z
P(x)	0.45	0.35	0.15	0.05

Probability Model D

x	100	200	300	400
P(x)	0.15	0.15	0.45	0.35

Probability Model E

x	0.25	0.5	0.75	1
P(x)	0.6	0.2	0.05	0.15

Question 18

Use the following information for Questions 18 - 23.

The driving performance of golfers is determined based on their Driving Distance (yards) and Driving Accuracy (%; for example, a value of 54.6 in the dataset means 54.6% driving accuracy). A researcher investigates the relationship between these two variables to see if Driving Accuracy can be predicted from Driving Distance.

The regression equation is given below:

PredictedDrivingAccuracyi=250.1420.629DrivingDistancei

What is the predicted value for Driving Accuracy when Driving Distance is equal to 300 yards? Answer to three decimal places as needed.

Question 19

Which interpretation of the intercept is correct (assuming that you choose to interpret the intercept)? Choose the correct answer below.

Group of answer choices

When the value for Driving Accuracy is zero, the predicted value for Driving Distance is equal to the intercept.

When the value for Driving Distance is zero, the predicted value for Driving Accuracy is equal to the intercept.

When the value for Driving Accuracy is at the maximum, the predicted value for Driving Distance is equal to the intercept.

When the value for Driving Distance is at the maximum, the predicted value for Driving Accuracy is equal to the intercept.

Question 20

Which interpretation of the slope is correct? Choose the correct answer below.

Group of answer choices

When the value for Driving Accuracy increases by 10, the predicted value for Driving Distance changes by the amount of the slope.

When the value for Driving Distance increases by 10, the predicted value for Driving Accuracy changes by the amount of the slope.

When the value for Driving Accuracy increases by 1, the predicted value for Driving Distance changes by the amount of the slope.

When the value for Driving Distance increases by 1, the predicted value for Driving Accuracy changes by the amount of the slope.