Suppose You Are Testing the Null Hypothesis That a Population

Multiple Choice

Suppose you are testing the null hypothesis that a population mean is less than or equal to 46, against the alternative hypothesis that the population mean is greater than 46.The sample size is 25 and α =.05.If the sample mean is 50 and the population standard deviation is 8, the observed z value is _______.

A) 2.5
B) -2.5
C) 6.25
D) -6.25
E) 12.5