Question

Researchers in the corporate office of an airline wonder if there is a significant difference between the cost of a flight on Priceline.com vs. the airline's own website. A random sample of 20 flights were tracked on Priceline and the airline's website and the average difference between the vendors was $4.294 with a standard deviation of $5.3109. The 99% confidence paired-t interval for price (Priceline - Airline Site) was (0.8965, 7.6915). Which of the following is the appropriate interpretation?

Question 4 options:

	1) The proportion of all flights that had a difference in price between the two vendors is 99%.
	2) We are 99% confident that the average difference in the prices of the flights sampled is between 0.8965 and 7.6915.
	3) We are certain the average difference in prices between the two vendors for all flights is between 0.8965 and 7.6915.
	4) We are 99% confident that the difference between the average price on Priceline and the average price on the airline's website is between 0.8965 and 7.6915.
	5) We are 99% confident that the average difference in price between the two vendors for all flights is between 0.8965 and 7.6915.

Question 5 (1 point)

The Student Recreation Center wanted to determine what sort of physical activity was preferred by students. In a survey of 50 students, 38 indicated that they preferred outdoor exercise over exercising in a gym. When estimating the proportion of all students at the university who prefer outdoor exercise with 90% confidence, what is the margin of error?

Question 5 options:

	1) 0.0060
	2) 0.0604
	3) 0.0991
	4) 0.0773
	5) 0.0140

Question 6 (1 point)

Professors in the Economics Department at Western want to determine how challenging the program was for students. Out of a random sample of 18 students, 13 indicated that the program was either "challenging" or "very challenging". The 90% confidence interval estimating the proprotion of all students in the department who thought the program was challenging is given by which of the following?

Question 6 options:

	1) ( 0.58693 , 0.85752 )
	2) ( 0.10413 , 0.45143 )
	3) ( 0.61665 , 0.82779 )
	4) ( 0.54857 , 0.89587 )
	5) ( -0.54857 , 0.89587 )

Question 7 (1 point)

Saved

Not all Walmart stores carry the same merchandise. In fact, in an audit of 1111 random stores, only 283 carried snowsuits seasonally. What is the 99% confidence interval estimate for the total number of Walmart stores that carry snowsuits?

Question 7 options:

	1) ( 0.22432 , 0.28514 )
	2) ( 0.22105 , 0.2884 )
	3) ( -0.22105 , 0.2884 )
	4) ( 0.24165 , 0.2678 )
	5)

Answer 1