Determine the test statistic and pvalue The service manager

Determine the test statistic and p-value.

The service manager for an automotive repair corporation wants to study the length of time required to replace the rear drum brakes of automobiles. A subgroup of 10 automobiles needing their brakes replaced was selected on each day for a period of 20 days. The accompanying data show the subgroup repair times. Complete parts a through c below. The manager has been trying to get the average time required to replace the rear drum brakes for subgroups of 10 automobiles to be under 2.5 hours. Use the data to determine if he has reached his goal. Use alpha = 0.10. What are the null and alternative hypotheses? What is the test statistic?

Solution

The test statistic t = (sample mean -2.5)/SE

where SE= stnadard deviation /sqrt(n).

Here the data is not provided so can\'t calculate the t-statistic value.