A survey of randomly selected college students found that 45 of the 99 freshmen and 57 of the 100 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)(0.317, 0.593)
B)(0.291, 0.593)
C)(-0.279, 0.049)
D)(0.291, 0.619)
E)(-0.253, 0.593)

Question

Quizplus · Accepted Answer

The confidence interval for the difference in proportions is calculated using the formula for the difference in sample proportions, considering the standard error and the z-score for 98% confidence.

A Survey of Randomly Selected College Students Found That 45