Question 1113100
Ho:  mu_r - mu_u = 0
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Ha:  mu_r - mu_u > 0
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This is a one-tailed test
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standard error(SE) = square root( ((8.19)^2/18) + ((9.59)^2/10) ) = 3.5949
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Degrees of Freedom is the lesser of (18-1) and (10-1) = 9
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t-statistic is (77.6 - 71.7) / 3.5949 = 1.6412
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Use student's t-table or a t-distribution calculator
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Probability(T< or = 1.6412) = 0.9324
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since 0.9324 is > 0.01, we can not reject Ho
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