Use the Traditional Method to Test the Given Hypothesis

question 130

Essay

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

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Definitions:

Contribution Margin Ratio

A ratio that measures the percentage of sales revenue available to cover fixed expenses and generate profit, calculated as the contribution margin divided by sales revenue.

Annual Fixed Expenses

Expenses that do not change in total regardless of changes in the volume of activity or production levels, such as rent or salaries.

Contribution Margin

The amount remaining from sales revenue after variable expenses are deducted, showing how much contributes to covering fixed costs and earning profit.

Break-even Point

The level of production or sales at which total revenues equal total expenses, resulting in no net profit or loss.