A psychologist would like to examine the effects of different testing methods on the final performance of college students. One group gets regular quizzes, one group gets three large exams, and the third group only gets a final exam. At the end of the course, the psychologist interviews each student to get a measure of the student's overall knowledge of the material (data on next page).

a.Conduct a hypothesis test to evaluate the significance of the difference between

the three methods. Use = .05 and make sure to go through all 4 steps.

b.Compute Tukey's HSD to determine exactly which methods are significantly

different.

QuizzesExamsFinal Only

410

642G = 36

350X² = 164

722

T = 20T = 12T = 4

SS = 10SS = 10SS = 4

(2 points) A researcher is interested in conducting a study that examines the possible interaction between gender (male/female), exercise (no exercise/exercise every other day/exercise every day), and diet (paleo/vegan/normal). What notation should the researcher use to describe their factorial design?

(6 points) Sketch a regression line that corresponds to the equation Y = -3X + 3. Sketch another regression line that corresponds to the equation Y = 2X - 4.