Consider the following hypothesis test:
h0:   u  u is less than or equal to 50
ha: u > 50
a sample of 60 is used and the population standard deviation is 8. use the critical value approach to state your conclusion for each of the following sample results. use = .05.
a. with  ? ?   x = 52.5, what is the value of the test statistic (to 2 decimals)?
can it be concluded that the population mean is greater than 50?
b. with  ? x?   = 51, what is the value of the test statistic (to 2 decimals)?
can it be concluded that the population mean is greater than 50?
c. with  ? x?   = 51.8, what is the value of the test statistic (to 2 decimals)?