The table compares x, the number of minutes of television sam watched each day, to y, the number of minutes she spent exercising. The function y = –0. 78x + 95 models the data in the table.

You want to test the hypothesis that smoking cigarettes increases the risk of lung cancer. in your experiment, you take 100 people of various ages and genders for each of your groups. one group smokes. the other group does not smoke. the group that does not smoke is called the group