A psychologist is interested in whether hypnosis affects brain dominance. Twelve college students from the freshmen class are randomly sampled for an experiment. The experiment has two conditions which are given on different days. In condition 1, the students are hypnotized and then given a test which measures the relative dominance of the right and left hemispheres. The higher the score, the more dominant is the right hemisphere. In condition 2, the same students are given the test again, only this time they are not hypnotized but are in their normal state of consciousness. The following scores are obtained. If you conclude to reject H ₀, the error(s) you may be making is(are) _________. A) a Type I error B) a Type II error C) that hypnosis may not affect brain dominance D) a Type I error and that hypnosis may not affect brain dominance E) a Type II error and that hypnosis may not affect brain dominance

Question

Quizplus · Accepted Answer

If we conclude to reject H0 (null hypothesis), it means we are accepting the alternative hypothesis that hypnosis affects brain dominance. However, we may be making a Type I error by rejecting a true null hypothesis. Additionally, even if we reject H0, it is still possible that hypnosis may not actually affect brain dominance. Therefore, the error(s) we may be making is a Type I error and believing that hypnosis may affect brain dominance when it actually does not. Hence, the best choice is D.

A Psychologist Is Interested in Whether Hypnosis Affects Brain Dominance