Author Question: A survey of randomly selected college students found that 52 of the 90 freshmen and 54 of the 117 ... (Read 125 times)

londonang · **on:** Jul 25, 2018

A survey of randomly selected college students found that 52 of the 90 freshmen and 54 of the 117 sophomores surveyed had purchased used textbooks in the past year.

Construct a 98 confidence interval for the difference in the proportions of college freshmen and sophomores who purchased used textbooks.
A) -0.021 to 0.711 B) 0.441 to 0.711 C) 0.416 to 0.736 D) -0.046 to 0.274

Question 2

A salesperson found that there was a 1 chance of a sale from her phone solicitations. Find the probability of getting 5 or more sales for 1000 telephone calls. Round the standard deviation to three decimal places to work the problem.

A) 0.0871 B) 0.0401 C) 0.8810 D) 0.9599