Question

Consider the following news headline, "Cigarette Smokers Make Lower College Grades Than Nonsmokers." The article goes on to say that researchers at a university collected information on the rate of cigarette smoking (total number of cigarettes smoked in a one-month period) and the college student's current GPA for completed college courses. They found that those with higher levels of cigarette use had lower GPAs, and vice versa. What can you rightfully conclude from this? Why? Be specific about what this kind of information may indicate and mean.

Answer 1

Sol:

correlation coefficient between the rate of cigarette smoking and college student's current GPA for completed college courses is positive

there exists a positive relationship between GPA and rate of cigarette smoking.

Form is linear

we can predict the GPA score given rate of cigarette smoking given regression equation.

GPA=a+b(rate of cigarette smoking).

GPA=dependent variable

rate of cigarette smoking=independent varaible

a=y intercept

b=slope

Install analysis tool pack in excel

go to excel data>data analysis >regression in excel.