Stats - Post Hoc Analysis

This is a question I am working on. i have successfully figured out part A and am having trouble with part B. (My work for Part B is shown below)
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Two new therapies designed to increase levels of self-esteem are tested in a clinical population. Nine subjects are randomly assigned to a control group (C) which is exposed to a placebo procedure. We also randomly assign 7 subjects to Therapy A (TA) and 9 other subjects to Therapy B (TB). Self esteem scores are measured for each group after a 2-month period and the following results are obtained (no subjects dropped out of the experiment):

Group C: X = 11.111

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