5. Consider a study where we investigate the effect of a type of golf ball on th

Question

5. Consider a study where we investigate the effect of a type of golf ball on the distance We have nr 20 golfers and 2 treatments (i.e. 2 types of golf balls). We are consid- ering two type of designs: Design I: Each golfer is randomly assigned a type of golf bal. Half of the golfers are assigned to type 1 and the remaining golfers will use the type 2 golf balls. We ask the golfers to hit a few golf balls and we compute the average distance of these hits. Design II: Each golfer will hit each type of ball a few times and we will compute the average distance for each type of golf ball. We randomize to order of the balls within each golfer. (a) Give the name of the two experimental designs. (b) If you were to choose between these two designs, which would you prefer? (Why?)

Explanation / Answer

(a)

Design I is Independent measures / between groups: Different participants (golfers) are used in each treatment (type of golf ball) of the independent variable.

Design II is Repeated measures /within groups: The same participants (golfers) take part in each treatment (type of golf ball) of the independent variable.

(b)

I would prefer the Design II, as each golfer are used in each treatment, golfers variables (i.e., individual differences, skill level) are reduced.

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