A university financial aid office polled a random sample of 467 male undergradua

Question

A university financial aid office polled a random sample of 467 male undergraduate students and 574 female undergraduate students. Each of the students was asked whether or not they were employed during the previous summer. 270 of the male students and 290 of the female students said that they had worked during the previous summer. Give a 90 % confidence interval for the difference between the proportions of male and female students who were employed during the summer Step 2 of 4: Find the critical value that should be used in constructing the confidence interval. Tables Keypad Answer How to enter your answer Previous Step Answers

Explanation / Answer

Probability (p): p = 1 - Î ± / 2

z = 1 - (0.9/2)
= 1 - 0.45 = 0.55

Referring the Z table, we have the Z critical value as 1.2816.

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