Given the following hypotheses:

H0: μ ≤ 11
H1: μ > 11

A random sample of 10 observations is selected from a normal population. The sample mean was 18 and the sample standard deviation 4.2. Using the 0.01 significance level:

a. State the decision rule. (Round your answer to 3 decimal places.)



b. Compute the value of the test statistic. (Negative answers should be indicated by a minus sign. Round your answer to 3 decimal places.)



c. What is your decision regarding the null hypothesis?