Chapter 9, Problem 72H

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 50, 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 $\bar{X}\sim$ _______________

a. $N\left(7.24,\frac{1.93}{\sqrt{22}}\right)$

b. N(7.24. 1.93)

c. t₂₂

d. t₂₁