Ben Has Used a Random Sample of 20,000 Respondents to Test

Multiple Choice

Ben has used a random sample of 20,000 respondents to test the relationship between participating in a summer reading program and children's reading scores in the following academic year.He observes a modest difference in reading scores by program participation and is able to reject the null hypothesis with a p-value of 0.04.When Ben presents his findings,his colleagues question whether the difference is very meaningful.Their concerns are most likely related to the fact that

A) his sample might not be representative of the population of children in schools.
B) he did not consider possible moderating variables.
C) his sample was so large that he was almost certain to find statistical significance.
D) a p-value is a very unreliable test for assessing statistical significance.