Question: 9.9 With reference to Exercise 8.5, test the null hypothesis that = 0.75 hours for the time that is required for repairs of the

9.9 With reference to Exercise 8.5, test the null hypothesis that σ = 0.75 hours for the time that is required for repairs of the second type of bulldozer against the alternative hypothesis that σ > 0.75 hours. Use the 0.10 level of significance and assume normality.

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