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Mathematics, 13.12.2019 23:31 lopezsharon333

An examination of the records for a random sample of 16 motor vehicles in a large fleet resulted in the sample mean operating cost of 26.31 cents per mile and the sample standard deviation of 2.80 cents per mile. (assume that operating costs are approximately normally distributed.) keep at least 4 significant digits in your answer.

1.construct a 95% confidence interval for the mean operating cost.2.construct a 90% confidence interval for the variance of the operating costs.3.the manager wants to believe that the actual mean operating cost is at most 25 cents per mile. perform the appropriate test at a 5% level of significance. what is the value of your test statistic? what is the critical value? accept or reject null hypothesis? 4. test whether the overall standard deviation of the operating costs is more than 2.30 cents per mile or not at a 5% significance level. what is the value of your test statistic? what is the critical value at a 5% significance level? accept or reject null hypothesis?

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