Question

1. For each scenario below, identify the independent variable (x) and the dependent variable (y). Identify and explain whether the two variables have a positive association, a negative association, or no association, and then choose a scatter plot that could represent the data.

Answer 1

(a) Marcus records the amount of lemonade that he sells each day and compares it to the temperature. He notices that when the temperature is warmer, he sells more lemonade.
(b) Ms. Tina compares the number of absences students have to their grades and notices that students who have more absences have lower grades.
(c) Shalika surveys her friends to see whether their height affects the amount of time they spend watching television. She finds that some of her taller friends watch a lot of television and some of them watch very little television.
(d) Mary-Ann compares the number of hours a person is in a mall to the amount of money the person has left in his or her wallet. She finds that the more time people spend in the mall, the less money they usually have left.
(e) Johanna read a study that stated that people who exercise more are expected to live longer.