An experimenter investigated the effects of a sensitivity training course on a policeman€™s effectiveness at resolving domestic disputes (using independent samples who had or had not completed the course). The dependent variable was the ability to resolve a domestic dispute. These success scores were obtained:

(a) Should a one-tailed or a two-tailed test be used?
(b) What are H0 and Ha?
(c) Subtracting course from no course, compute tobt and determine whether it is significant.
(d) Compute the confidence interval for the difference between the ^s.
(e) What conclusions can the experimenter draw from these results?
(f) Using our two approaches, compute the effect size and interpret it.

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No Course Course 14 10 12 13 16 14 17 15 12 13 14 15 18 12