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8-11.

The school counselors are worried about the study habits of students who are involved in a lot of after-school activities. They randomly selected students at the school and gathered the following data. Consider the number of activities the independent variable.

# OF STUDENTS

Hours Spent Studying Per Week

Hours of After-School
Activities Per Week

Less Than Hours

Eight or More Hours

Less Than Hours

# of students spends less than 5 hours of after school activities per week and spends less than 8 hours of studying per week: 

# of students spends less than 5 hours of after school activities per week and spends 8 or more hours of studying per week: 

Five or More Hours

# of students spends 5 or more hours of after school activities per week and spends less than 8 hours of studying per week: 

# of students spends 5 or more hours of after school activities per week and spends 8 or more hours of studying per week: 

  1. Make a conditional relative frequency table.

    What is the total number of hours in each row? What is the percentage of this total for each column?
    Use this information to make your table.

  2. Is there an association between the amount of time spent studying and number of after-school activities?

  • There is an association, but is it the association you would expect?