Question

You are conducting a study with 275 randomly selected participants in a math learning program. The program consists of 3 interventions and all participants receive all three interventions within a 2 day period. You measure their weight at the beginning of the study, after the first intervention, after the second intervention and after the third intervention. This study design may be problematic because of:

a.

carry over effects

b.

lack of independence

c.

low power

d.

low sample size

Answer 1

Correct option:

a.    Carry over effect

EXPLANATION:

Th objective of the study is to effect of weight for each intervention separately. But, the result of the study in the way the experiment is conducted will not yield the correct result because of carry over effects as follows:

After Intervention1 : The weight after Intervention1 is due to the effect of Intervention 1. This is correct result.

After Intervention 2 : the difference in weight after Intervention 2 will not give the effect of Intervention 2 alone because effect of Intervention 1 is also carried over.. So, this is not correct result.

After Intervention 3 : the difference in weight after Intervention 3 will not give the effect of Intervention 3 alone because effect of Intervention 1 and Intervention 2 are also carried over.. So, this is not correct result