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Confidence Intervals and Hypothesis Testing

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Please help with the following problem. Provide step by step calculations in Excel.

17. Consider a 98% confidence interval to estimate a population mean based on a sample of 625 observations with a sample mean of 425 and a sample standard deviation of 150. How many units wide would such a confidence interval be?

18. In a right-tail hypothesis test situation based on 1 sample of 15 observations when the population variance is unknown the null hypothesis would be rejected at 5% significance level if the test statistic was greater than what value?

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Solution Summary

The following posting helps with a hypothesis testing problem. This solution provides calculations for finding confidence intervals and rejecting null hypotheses. Provide step by step calculations in the solution.

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Calculations are done in excel.

17. Consider a 98% confidence interval to estimate a population mean based on a sample of 625 observations with a sample mean of 425 and a sample standard deviation of 150. How many units wide would such a confidence interval ...

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