To compare the effectiveness of isometric and isotonic exercise methods, 20 obese male students are included in an experiment: 10 are selected at random and assigned to one exercise method; the remaining 10 are assigned to the other exercise method. After five weeks, the reductions in abdomen measurements are recorded in centimeters, and the following results are obtained.

(a) Do these data support the claim that the isotonic method is more effective?
(b) Construct a 95% confidence interval for μB - μA.

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Isometric Method A Isotonic Method B Mean Standard deviation 2.4 0.8 3.2 1.0