According to one study, the average hours of sleep teenagers aged 14-18 get are greater than 10 hours. The data obtained are: 8, 6, 4, 8, 8, 6, 8, 8, 5, 7, 8, 4, 8, 5, 5, 5, 8, 7, 6, 7, 8, 6, 7, 8, 4, 8, 7, 5, 8, and 10 hours. Perform a test of hypothesis at 5% level of significance to make an empirical conclusion on the study's claim.

n= 30

Mean= 6.73

Variance= 2.41

Standard deviation= 1.55

1. Formulate null and alternative hypothesis?
2. What is the computed test statistics?
3. What is your decision? (Reject Ho or Do not reject Ho)
4. What is the appropriate test statistics? (Z - test or t-test)
5. What is your conclusion