Question

A psychologist is trying to determine whether monkeys who go through behavior modification training will obey commands (like sit, play dead, give 5, etc.) more than monkeys who do not go through the training. From his previous research, he has determined that the average number of commands that untrained monkeys obey in a 30-minute testing session is 6. The researcher randomly selects 9 monkeys for the training. After training, he tests each of the subjects in the same 30-minute testing session. The data are as follows: 9, 2, 8, 5, 7, 10, 12, 3, 6. Using an alpha level of .05, test the psychologist’s hypothesis.

1. What would be the most appropriate statistical procedure to evaluate this hypothesis (e.g. z-test for a single individual, z-test for a single sample, t-test for a single sample)?
2. Why would this be the correct test?
3. Use the steps of hypothesis testing to evaluate this hypothesis.
   1. State the hypotheses.
   2. Determine the critical value(s) of your statistic for rejecting the null based on the given alpha level/sample size/hypothesis.
   3. Calculate the statistic.
   4. Based on this statistic would you accept or reject the null hypothesis?
4. If conducting a single sample z-test or a single sample t-test, calculate the effect size.
5. Draw a conclusion about the overall support provided for the research hypothesis.

Answer 1