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 80, against the alternative hypothesis that the population mean is greater than 80.The sample size is 49 and alpha =.05.If the sample mean is 84 and the population standard deviation is 14, the observed z value is ___.

A) 2
B) -2
C) 14
D) -14
E) 49