Two groups of students are given a problem-solving test, and the results are compared. Find the 90% confidence interval of the true difference in means.

a. State the hypotheses and identify the claim.
b. Find the critical value(s).
c. Compute the test value.
d. Make the decision.
e. Summarize the results.

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Mathematics majors X 83.6 n, 36 Computer science majors X 79.2 σ2 = 3.8 n2 36