4. An experimenter investigated the effects of sensitivity training on police officers' effectiveness at resolving domestic disputes. She randomly sampled a group of police officers who had completed a sensitivity course and a group of officers who had not. Participants were tested on their ability to successfully resolve a simulated domestic dispute. The scores below were obtained. Test the researcher's hypothesis with ? = .01. Zero Hours of Course (NT) | 10 Hours of Course (T) ---|--- 11 | 13 16 | 16 10 | 14 12 | 9 9 | 11 15 | 13 13 | 15 13 | 15 9 | 12 12 | 11 a. Use the 5-step procedure test the hypothesis. (22 points) b. Calculate the 99% confidence interval. (4 points) c. Calculate and estimate the effect size. (4 points) d. Using the appropriate power table in the textbook, what is the approximate power of this test? Discuss at least three ways that you could increase the power of the test. (10 points)
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State the Hypotheses: The null hypothesis (H0) is that there is no difference in the effectiveness of police officers at resolving domestic disputes whether they have completed a sensitivity course or not. The alternative hypothesis (H1) is that there is a Show more…
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An experimenter investigated the effects of sensitivity training on Public Safety officers’ effectiveness at resolving conflicts. She compared a sample of officers that had completed the training, with a different sample that had not. The dependent variable was the officers’ ability to successfully resolve a simulated dispute in a dorm. The following resolution scores were obtained: No Course Course 11 14 10 12 8 15 12 13 9 11 13 16 14 17 11 14 15 18 12 11 a. What are H0 and Ha? (Consider No Course to be m1 and Course to be m2) H0 : Ha: b. Are the differences between No Course and Course groups significant? (at standard .05 level) c. Compute the effect size for this result : d: What does this effect size say about the variance accounted for by this relationship?
Danielle F.
A researcher plans to conduct an experiment evaluating the effect of a treatment. A sample of $n=9$ participants is selected and each person receives the treatment before being tested on a standardized dexterity task. The treatment is expected to lower scores on the test by an average of 30 points. For the regular population, scores on the dexterity task form a normal distribution with $\mu=240$ and $\sigma=30.$ a. If the researcher uses a two-tailed test with $\alpha=.05$ what is the power of the hypothesis test? b. Again assuming a two-tailed test with $\alpha=.05$ what is the power of the hypothesis test if the sample size is increased to $n=25 ?$
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