A university is interested in promoting graduates of its honors program by establishing that the mean GPA of these graduates exceeds 3.75. A sample of 36 honors students is taken and is found to have a mean GPA equal to 3.80. The population standard deviation is assumed to equal 0.25. At a 2.5% significance level, the critical value(s) is (are) ________.     a. –1.96 and 1.96 b. –1.645 and 1.645 c. 1.645 d. 1.96

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