A Simple Random Sample of 20 Third-Grade Children from a Certain

question 82

Multiple Choice

A simple random sample of 20 third-grade children from a certain school district is selected,and each is given a test to measure his/her reading ability.You are interested in calculating a 95% confidence interval for the population mean score.In the sample,the mean score is 64 points and the standard deviation is 12 points.What is the margin of error associated with the confidence interval?

• A)2.68 points
• B)4.64 points
• C)5.62 points
• D)6.84 points

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Definitions:

Variable Costing

A cost accounting method that only includes variable production costs in the cost of goods sold, excluding fixed manufacturing overhead.

Net Operating Income

A measure of a company's profitability, calculated as the difference between its total revenue and its total operating expenses, excluding taxes and interest.

For The Month

A time-based reference indicating that an action, report, or measurement pertains to the duration of a specific month.

Variable Costing

An accounting method that includes only variable production costs in the cost of goods sold and treats fixed production costs as period expenses.