Do One of the Following, as Appropriate: (A) Find the Critical

Multiple Choice

Do one of the following, as appropriate: (a) Find the critical value $z_{?/2}$ , (b) find the critical value $t_{?/2}$ , (c) state that neither the normal nor the t distribution applies
-A $99 \%$ confidence interval (in inches) for the mean height of a population is $65.64 < \mu < 67.16$ . This result is pased on a sample of size 144 . If the confidence interval $65.85 < \mu < 66.95$ is obtained from the same sample data, what is the degree of confidence? (Hint: you will first need to find the sample mean and sample standard deviation) .

A) $94 \%$
B) $92 \%$
C) $93 \%$
D) $95 \%$