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 24 flights were tracked on Priceline and the airline's website and the average difference between the vendors was $2.971 with a standard deviation of $9.9905. The 99% confidence paired-t interval for price (Priceline - Airline Site) was (-2.754, 8.696). Which of the following is the appropriate interpretation?

Question 4 options:

	1) We are 99% confident that the average difference in the prices of the flights sampled is between -2.754 and 8.696.
	2) We are 99% confident that the average difference in price between the two vendors for all flights is between -2.754 and 8.696.
	3) We are certain the average difference in prices between the two vendors for all flights is between -2.754 and 8.696.
	4) The proportion of all flights that had a difference in price between the two vendors is 99%.
	5) We are 99% confident that the difference between the average price on Priceline and the average price on the airline's website is between -2.754 and 8.696.

The Student Recreation Center wanted to determine what sort of physical activity was preferred by students. In a survey of 95 students, 62 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 99% confidence, what is the margin of error?

Question 5 options:

	1) 0.1260
	2) 0.0129
	3) 0.1138
	4) 0.0062
	5) 0.0489

To design a new advertising campaign, Ford Motor Company would like to estimate the proportion of drivers of the new Ford Fusion that are women. In a random sample of 93 Fusion owners, 51 of them were women. What is the 95% confidence interval estimating the proportion of all drivers who are women?

Question 6 options:

	1) ( 0.44724 , 0.64953 )
	2) ( 0.35047 , 0.55276 )
	3) ( -0.44724 , 0.64953 )
	4) ( 0.49678 , 0.59999 )
	5) ( 0.46351 , 0.63327 )

Answer 1