# Testing of Hypothesis and Confidence Interval

Use the traditional method to test the given hypothesis. Assume that the population is normally distributed and that the sample has been randomly selected.

10) In one town, monthly incomes for men with college degrees are found to have a standard deviation of $650. Use a 0.01 significance level to test the claim that for men without college degrees in that town, incomes have a higher standard deviation. A random sample of 22 men without college degrees resulted in incomes with a standard deviation of $901.

7) 34 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 25.9 pounds and a standard deviation of 3.8 pounds. What is the 95 percent confidence interval for the true mean weight, μ, of all packages received by the parcel service?

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10) In one town, monthly incomes for men with college degrees are found to have a standard deviation of $650. Use a 0.01 significance level to test the claim that for men without college degrees in that town, incomes have a higher standard deviation. A random sample of 22 men without college degrees resulted in incomes with a standard deviation of $901.

7) 34 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 25.9 pounds and a ...

#### Solution Summary

The solution contains the construction of 95 percent confidence interval for the mean and testing of hypothesis problem concerning standard deviation.