A random sample of 13 observations is selected from a normal population. The sample mean was 475 and the sample standard deviation 9. Using the 0.05 significance level:
a. State the decision rule. (Negative amount should be indicated by a minus sign. Round your answers to 3 decimal places.)
b. Compute the value of the test statistic. (Round your answer to 3 decimal places.)
c. What is your decision regarding the null hypothesis?
