9.3 Exercise 12

It is believed that Lake Tahoe Community College (LTCC) Intermediate Algebra students get less than seven hours of sleep per night, on average. A survey of 22 LTCC Intermediate Algebra students generated a mean of 7.24 hours with a standard deviation of 1.93 hours. At a level of significance of 5 percent, do LTCC Intermediate Algebra students get less than seven hours of sleep per night, on average? The distribution to be used for this test is $\bar{X}$ ~ ________________

1. $N \left(7.24 , \frac{1.93}{\sqrt{22}}\right)$
2. $N \left(7.24 , 1.93\right)$
3. t₂₂
4. t₂₁