Question

In a recent survey of 114 WMU graduates, 52 students said that parking was too limited on campus. What is the estimate of the population proportion? What is the standard error of this estimate?

Question 1 options:

	1) Estimate of proportion: 0.456, Standard error: 0.0044.
	2) Estimate of proportion: 0.456, Standard error: 0.0466.
	3) Estimate of proportion: 0.544, Standard error: 0.0466.
	4) The true population proportion is needed to calculate this.
	5) Estimate of proportion: 0.544, Standard error: 0.0044.

Question 2 (1 point)

Historically, 85.25% of packages delivered by UPS are on time. Suppose 136 deliveries are randomly selected for quality control. What is the probability that between 79.65% and 85.29% of the deliveries were on time?

Question 2 options:

	1) 10.7123
	2) 0.4725
	3) 0.5275
	4) 15.5256
	5) 0.5380

Question 3 (1 point)

Fill in the blank. Speed Car Rental company found that the tire lifetime for their vehicles has a mean of 46,948.87 miles and standard deviation of 5,120.24 miles. In a sample of 63 tires tested, there is a 69% chance that the average tire lifetime is greater than ________ miles.

Question 3 options:

	1) 47,268.74
	2) There is not enough information to determine this.
	3) 46,629
	4) 49,487.74
	5) 44,410

Question 4 (1 point)

The Department of Transportion (DOT) is attempting to determine the proportion of drivers who require all passengers in the car to wear their seatbelt before putting the vehicle in drive. A survey of 79 drivers is performed and 29 people say they will not drive until all passengers in the vehicle are buckled up. To report their finding they want to create a 90% confidence interval. What would be the margin error for this confidence interval?

Question 4 options:

	1) 0.0694
	2) 0.0889
	3) 0.0048
	4) 0.0100
	5) 0.0542

Question 5 (1 point)

You are interested in getting an investment portfolio started with any extra money you make from your part time job while also going to school. While flipping through the latest edition of Money magazine, you read an article that of a survey of magazine subscribers, 164 were randomly selected and analyzed. A 99% confidence interval was constructed for the proportion of all subscribers who made money in the previous year in their investments, which was ( 0.704 , 0.8691 ). What is the correct interpretation of this confidence interval?

Question 5 options:

	1) We are 99% confident that the proportion of all Money magazine subscribers that made money in the previous year from their investments is between 0.704 and 0.8691.
	2) We are 99% confident that the proportion of all Money magazine subscribers sampled that made money in the previous year from their investments is between 0.704 and 0.8691.
	3) We are certain that 99% of subscribers made between 0.704 and 0.8691.
	4) We cannot determine the proper interpretation of this interval.
	5) We are 99% confident that of the 164 respondents, between 0.704 and 0.8691 of them made more than they lost.

Answer 1

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