Question

Consider the following hypothesis test: Ho u-15 Ha does not equal 15. A sample of 40 provided a sample mean of 14.18. The population standard deviation is 4. Enter negative value as negative number.

1.Compute the value of the test statistic to two decimals.

2. What is the p-value (to four decimals)? Use the value of the test statistic rounded to decimal places in your calculations.

3. Using alpha = 0.05, can it be concluded that the population mean is not equal to 15?

Answer the next three using the critical value approach

4. Using alpha = 0.05, what are the critical values for the test statistic (+ or -) (to two decimals)?

5. State the rejection rule: Reject H0 if Z is ___ the lower critical value and is ___ the upper critical value. Can it be concluded that the population mean is not equal to 15 ___?

Answer 1