Practice Test 12

A teacher surveyed 50 students about whether they have a curfew (Yes/No) and whether they have regular chores (Yes/No). Data: Curfew Yes: 20 with chores, 10 without. Curfew No: 5 with chores, 15 without. Which comparison best supports the claim that curfew and chores are associated?

A teacher collected data from 80 students about grade level (6th or 8th) and whether they are in an after-school activity (Yes/No):

• 6th grade: 25 in activities, 15 not in activities
• 8th grade: 30 in activities, 10 not in activities

How many students in the survey are not in an after-school activity?