Question

Ch. 10 Take-Home Test Name: Hannah Keel AP Statistics Due Date: Febuary 21st Directions: Use your own paper. For each question, select the letter of the best answer. 1. You want to compute a 96% confidence interval for a population mean. Assume that the population standard deviation is known to be 25 and the sample size is 30. The z critical value is (a) 1.960 (b) 1.645 (c) 1.7507 (d) 2.0537 (e) None of the above.

Answer 1

Answer:-

We have given that 96 % confidence interval which implies ( 1 - $\alpha$ ) = 0.96 , then $\alpha$ = 0.04 for two sided is

From Z table

Then Z_{​​​​critical} = 2.0537

Option (d ) is correct.

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