Devise a null and alternative hypothesis then perform a one sample z-test using alpha 0.05 if the class is shorter or taller than the average human in the United States. Graphically display your...

Devise a null and alternative hypothesis then perform a one sample z-test using alpha 0.05 if the class is shorter or taller than the average human in the United States. Graphically display your answer and statistically write up the results. United States average is 67 +/- 3.8 inches. The class mean is 69 inches and the class standard deviation is 5.9 inches. The class sample size is 21 students.