The mean quiz grade for a class has been constant for several years with mean = 21 and standard deviation = 15. The teacher has employed a supplementary instructor to increase the grades. We run a hypothesis test to see if this additional level of support is effective at increasing scores at the 1% level of significance. Assume that their sample of size 25 students gives a mean of 29. Perform a hypothesis test (6-step procedure) at the 1% level of significance and state your decision.

1. What is the claim that you're testing?
2. State your null and alternative hypotheses.
3. Is this a one-tailed or two-tailed test? What is the alpha level?
   • What is the crititcal value for this test?
4. What is the value of the test statistic.
5. What is the p-value for the test statistic.
6. What is your decision (reject the null or fail to reject the null) and why?

You should use the Unit table