Question: A test is made of H0 : = 12 versus H1: 12. The value of the test statistic is z = 1.78.

A test is made of H0 : μ = 12 versus H1: μ ≠ 12.

The value of the test statistic is z = 1.78.

a. Find the critical value and the critical region for a significance level of

α = 0.05.

b. Do you reject H0 at the α = 0.05 level?

c. Find the critical value and the critical region for a significance level of

α = 0.01.

d. Do you reject H0 at the α = 0.01 level?

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