Question

****PLEASE ANSWER ALL QUESTIONS****

Question 1 (1 point)

164 employees of your firm were asked about their job satisfaction. Out of the 164, 47 said they were unsatisfied. What is the estimate of the population proportion? What is the standard error of this estimate?

Question 1 options:

	1) Estimate of proportion: 0.713, Standard error: 0.0028.
	2) Estimate of proportion: 0.287, Standard error: 0.0353.
	3) Estimate of proportion: 0.287, Standard error: 0.0028.
	4) Estimate of proportion: 0.713, Standard error: 0.0353.
	5) The true population proportion is needed to calculate this.

Question 2 (1 point)

Suppose the nationwide high school dropout rate for 2014 was around 14.62%. If you checked the records of 472 students in high school in 2014, what is the probability that greater than 14.97% of them ended up dropping out?

Question 2 options:

	1) 0.5000
	2) <0.0001
	3) 0.4148
	4) -22.9702
	5) 0.5852

Question 3 (1 point)

An airline records flight delays in and out of Chicago O'Hare airport for a year. The average delay for these flights is 9.64 minutes with a standard deviation of 3.51 minutes. For a sample of 49 flights, 94% of flights will have an average delay less than how many minutes?

Question 3 options:

	1) 8.86
	2) 10.42
	3) 15.1
	4) 4.18
	5) There is not enough information to determine this.

Question 4 (1 point)

A U.S. census bureau pollster noted that in 411 random households surveyed, 252 occupants owned their own home. For a 95% confidence interval for the proportion of home owners, what is the margin of error?

Question 4 options:

	1) 0.0471
	2) 0.0394
	3) 0.0011
	4) 0.0023
	5) 0.0240

Question 5 (1 point)

The Student Recreation Center wanted to determine what sort of physical activity was preferred by students. In a survey of 64 students, 39 indicated that they preferred outdoor exercise over exercising in a gym. They estimated the proportion of students at the university who prefer outdoor exercise as ( 0.452 , 0.7667 ), with 99% confidence. Which of the following is an appropriate interpretation of this confidence interval?

Question 5 options:

	1) We are certain that 99% of students will be between 0.452 and 0.7667.
	2) We are 99% confident that the proportion of students surveyed who prefer outdoor exercise is between 0.452 and 0.7667.
	3) We are 99% confident that the proportion of all students at the university who prefer outdoor exercise is between 0.452 and 0.7667.
	4) We are 99% confident that the proportion of exercise time which the average student spends outdoors is between 0.452 and 0.7667.
	5) We cannot determine the proper interpretation of this interval.

Question 6 (1 point)

The owner of a local phone store wanted to determine how much customers are willing to spend on the purchase of a new phone. In a random sample of 13 phones purchased that day, the sample mean was $493.254 and the standard deviation was $21.6007. Calculate a 90% confidence interval to estimate the average price customers are willing to pay per phone.

Question 6 options:

	1) ( 487.263 , 499.245 )
	2) ( 482.576 , 503.932 )
	3) ( -482.576 , 503.932 )
	4) ( 482.644 , 503.864 )
	5) ( 491.472 , 495.036 )

Answer 1