Consider the following hypothesis test: Ho: u=15 Ha: u is not equal to 15. A sample of 40 provided a sample mean of 14.16. The population standard deviation is 4. Enter negative value as negative number. a. Compute the value of the test statistic (to 2 decimals) b. What is the p-value (to 4 decimals)? Use the value of the test statistic rounded to 2 decimal places in your calculations. c. Using a = 0.05, can it be concluded that the population mean is not equal to 15? - Select your answer- Answer the next three questions using the critical value approach. d. Using a = 0.05, what are the critical values for the test statistic? ( +or -) (to 2 decimals) State the rejection rule: Reject Ho if z is-Select your answer the lower critical value and is -select your answer the upper critical value. Can it be concluded that the population mean is not equal to 15? - Select your answer