Suppose You Are Testing the Null Hypothesis That a Population $\alpha$

Multiple Choice

Suppose you are testing the null hypothesis that a population mean is greater than or equal to 60, against the alternative hypothesis that the population mean is less than 60.The sample size is 64 and $\alpha$ = .05.If the sample mean is 58 and the population standard deviation is 16, the observed z value is _______.

A) -1
B) 1
C) -8
D) 8
E) 58