7. Match each of the following types of causal relationships with the most appropriate example from the list below. [3K] a) cause-and-effect relationship d) accidental relationship b) common-cause factor e) reverse cause-and-effect relationship As the number of cell phones sold rises, the number of students involved in extracurricular activities rises As the population of certain species of animals decreases, the amount of logging in wilderness areas increases. As the amount of multi-vitamins sold rises, the number of people with colds decreases. 8. A professor tracks the mean final grade for her first-year statistics' classes over a number of years to determine if the class size affects student performance. [A/T] Class size 110 68 62 132 145 106 81 Final grade Average 65 70 69 63 66 60 67 a) Create a scatter plot and draw a line of best fit. Label the plot properly. [2]