A researcher is investigating whether rats can learn their way through a maze by observation.One sample of rats (the observer group) first watches other rats solve the maze then tries the maze; a second sample (the exposure group) simply gets to see the maze before trying it; and a third sample (the no-exposure group) is put in the maze without any previous exposure at all.The researcher performs three two-sample t-tests to compare the mean time to complete the maze between the observer and exposure groups; between the exposure and no-exposure groups; and between the observer and no-exposure groups.One of the the three t-tests is significant (p < .05).The researcher concludes that there are real differences among the groups.What is wrong with the researcher's conclusion?

Select one:

a.The researcher should have performed matched pairs t tests rather than two-sample t tests.

b.Running multiple t-tests results in an inflated Type I error rate; the researcher should have run a one-way ANOVA to see if the group means are significantly different.

c.The power of the experiment to detect differences between the three groups is unacceptably low.