An eating disorders clinic would like to evaluate theeffectiveness of a mindfulness training program on binge eatingdisorder (BED). A psychologist was therefore hired to conduct asmall study to examine the potential effect of mindfulness trainingon number of binges per month. The psychologist recruited 10patients in the clinic to participate in a mindfulness trainingprogram and 12 patients in the clinic with similar demographics whodo not participate in the mindfulness program. Afterward, allparticipants reported the number of binges from the previous month.The data are listed in the table below. The psychologist is notpredicting a particular direction of the potential differencesbetween the two groups and she sets the alpha level at .05 for thehypothesis test.

Mindfulness training		No mindfulness training
Subject ID #	# of binges	Subject ID #	# of binges
1	6	11	7
2	4	12	8
3	4	13	6
4	5	14	9
5	3	15	4
6	4	16	6
7	5	17	6
8	5	18	8
9	7	19	9
10	3	20	8
			21	7
			22	5

1. a) Calculate standard deviation of the comparisondistribution

1. b) Calculate the t statistic

1. c) Considering the research question and the hypotheses, shouldthe test be one-tailed or two-tailed? Why?

1. d) Determine the critical t value(s) for this hypothesis testbased on the degree of freedom, from (d), and the preset alphalevel.

1. e) Compare the calculated t statistic with thecritical t value by stating which is more “extreme”, andthen make a decision about the hypothesis test by stating clearly“reject” or “fail to reject” the null hypothesis.

f) Calculate the pooled standard deviation for the populationsand then use it to calculate the standardized effect size of thistest.