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Suppose that you want to determine whether there is a difference between the distances traveled by an air-filled football and by a helium-filled football, and that you have managed to recruit 12 punters of varying abilities to participate in the study. Describe, in detail, the design of an experiment that does not utilize pairing. Next, describe, in detail, the design of an experiment that does utilize pairing. Which study design (a) or (b) do you think is a better study design for the purpose of this study or does it not matter

Sagot :

batolisis

Answer:

a) step 1 : Divide the punters into two equal groups

  step 2 : Punters in each of the group is made to kick the ball ( i.e. Group 1    kicks an air filled football while group 2 kicks helium filled football )

step 3 : measure the average distances that the ball travelled in each group

step 4 : compare the results and draw a conclusion

b)  

Each punter is given both air filled and helium filled footballs

Each punter kicks both the air filled and helium filled footballs

The distances travelled by the balls are recorded ( measured in pairs )

c)  Design B

Explanation:

Given data:

Aim : To determine if there is a difference between distances travelled by an air-filled football and a helium-filled football

An air filled football and a helium-filled football

Number of punters recruited for the test = 12

a) Description of an experiment that does not require pairing

step 1 : Divide the punters into two equal groups

step 2 : Punters in each of the group is made to kick the ball ( i.e. Group 1 kicks an air filled football while group 2 kicks helium filled football )

step 3 : measure the average distances that the ball travelled in each group

step 4 : compare the results and draw a conclusion

b) Description of an experiment that requires pairing

Each punter is given both air filled and helium filled footballs

Each punter kicks both the air filled and helium filled footballs

The distances travelled by the balls are recorded ( measured in pairs )

c) Design B is better because the ability of each punter while kicking the balls are not the same hence there is need to allow each punter kick both balls, also for paired design/experiment.  T-test can be applied

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