Random Samples of Size 81 Are Taken from a Process

question 38

Multiple Choice

Random samples of size 81 are taken from a process (an infinite population) whose mean and standard deviation are 200 and 18, respectively. The distribution of the population is unknown. The mean and the standard error of the distribution of sample means are _____.

• A) 200 and 18
• B) 81 and 18
• C) 9 and 2
• D) 200 and 2

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Definitions:

Pretax Income

Income earned by an entity before any taxes have been deducted.

Operating Leverage

The degree to which a firm or project can increase operating income by increasing revenue, reflecting the fixed versus variable cost structure.

Clockworks Co.

A hypothetical or generic name that could be used to refer to a company specializing in mechanical devices, especially those involving gears and timekeeping mechanisms.

Contribution Margin Ratio

The ratio that indicates the percentage of each sale that exceeds the variable costs, calculated by subtracting variable costs from sales revenue and dividing by sales revenue.