12. In Chapter 10, Practice Problem 10.2 (p. 262), an experiment was conducted to determine whether watching a particular TV program resulted in increased violence in teenagers. In that experiment, 15 subjects were run with each subject serving in an experimental and control condition. The sign test was used to analyze the data, with   0.011 tail.

Suppose the TV program does increase violence and that the effect size is medium (Preal  0.70). Before running the experiment, what is the probability that the experiment will detect at least this level of real effect? What is the probability of a Type II error? The data collected in this experiment failed to allow rejection of H0. Are we therefore justifi ed in concluding that the TV program has no effect on violence in teenagers? Explain. social