1. Null (Ho) and Alternative (Ha) Hypotheses

a. The time needed for college students to complete certain paper and pencil maze follows a normal distribution with a mean of 30 seconds and a standard deviation of 3 seconds.You wish to see if the mean time is changed by vigorous exercise, so you have a group of nine college students exercise vigorously for 20 minutes and then complete the maze.

b. A national study reports that households spend an average of 30% of their food expenditures in restaurants. A restaurant association in your area wonders if the national finding applies locally and believes that local households spend more than the national average.They interview a sample of 40 households and ask about their food budget and the amount spent in restaurants.