# Suppose that the average grade for all people who take a class is 83 with a standard deviation of 3.5

Suppose that the average grade for all people who take a class is 83 with a standard deviation of 3.5. If your particular class has an average of 89, can you conclude that your class is better than average at the 90 percent confidence level? Label and describeeach step of the hypothesis testing procedure, and be sure to specify whether this is a one-tailed or two-tailed test.

© BrainMass Inc. brainmass.com June 4, 2020, 3:02 am ad1c9bdddfhttps://brainmass.com/statistics/hypothesis-testing/average-grade-people-class-495534

#### Solution Preview

In this question, you need to know the size of this class. I just assume that the size is n=30. This number may affect the final conclusion.

Now we perform a 5-step hypothesis test.

Step 1: Set up hypotheses.

H0: mu<=83

Ha: ...

#### Solution Summary

The expert determines the average grade for all people who take a class is 83.

$2.19