In Each of the Following Cases, We Wish to Test $\mu$

Multiple Choice

In each of the following cases, we wish to test the null hypothesis H₀: $\mu$ =18. In which case can this null hypothesis be rejected at a significance level $\alpha$ = 0.05?

A) 95% confidence interval for $\mu$ is (16 to 21) , H_a: $\mu$ $\neq$ 18.
B) 90% confidence interval for $\mu$ is (15 to 20) , H_a: $\mu$ < 18.
C) 90% confidence interval for $\mu$ is (19 to 26) , H_a: $\mu$ > 18.
D) 90% confidence interval for $\mu$ is (15 to 22) , H_a: $\mu$ $\neq$ 18.