A random sample of 20 high school students were asked how many hours they sleep per night. Summary statistics and a histogram of the sample (to check for outliers) are provided below. Calculate a p-value for a two-sided hypothesis test to evaluate whether the amount of sleep they get differs from 8 hours.

H0:? = 8

HA: ? ? 8

Sample: 20

Sample Mean: 7.5

Standard Deviation: 1.1

Min: 5.5

Max: 9

Be sure to check conditions, identify the degrees of freedom, calculate a test statistic, and show your work.