Evaluating the Experiment from the Inside: Internal Validity Jack just completed a study of the effects of caffeine and rave music on recall.He is excited about finding a significant interaction and says, "This is so cool! I've proved my research hypothesis.Jolt cola with rave music is the way to study." Jack's experiment cannot prove his research hypothesis because his results could be due to
A)confounding.
B)Type 1 error.
C)Type 2 error.
D)confounding and/or Type 1 error.

Question

Quizplus · Accepted Answer

Jack's experiment cannot prove his research hypothesis because his results could be due to confounding and/or Type 1 error. Confounding occurs when an extraneous variable that was not controlled for affects the results. Type 1 error occurs when the null hypothesis is mistakenly rejected, indicating a significant effect when there actually is none. Therefore, Jack's excitement about proving his research hypothesis is premature and his results must be interpreted with caution.

Evaluating the Experiment from the Inside: Internal Validity Jack Just