A Researcher Was Interested in Comparing the Number of Hours

question 22

Multiple Choice

A researcher was interested in comparing the number of hours of television watched each day by two-year-olds and three-year-olds.A random sample of 18 two-year-olds and 18 three-year-olds yielded the follow data. $$\begin{array} { r r | l r } &\text { 2-year-olds } & \text { 3-year-olds } \\\hline 0.5 & 1.5 & 2.0 & 3.0 \\1.5 & 2.0 & 1.5 & 1.5 \\1.5 & 0 & 1.5 & 2.0 \\1.0 & 1.0 & 1.0 & 0 \\1.0 & 0 & 0 & 1.5 \\2.0 & 1.5 & 1.5 & 2.0 \\2.5 & 2.0 & 2.5 & 2.0 \\0.5 & 0 & 3.0 & 1.0 \\1.5 & 2.5 & 1.5 & 0.5\end{array}$$ Find a 95% confidence interval for the difference, $\mu 2$ - $\mu 3$ ,between the mean number of hours for two-year-olds and the mean number of hours for three-year-olds.

• A)(-0.87,0.26)
• B)(1.25,1.56)
• C)(-0.87,-0.26)
• D)(-1.56,-1.25)
• E)(-0.26,0.87)

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Definitions:

Labor Price Variance

The difference between the actual cost of labor and the budgeted or standard cost of labor.

Factory Labor

The workforce engaged in the manufacture of goods, particularly those who are directly involved in producing products in a factory setting.

Standard Cost Accounting System

An accounting framework that uses cost units determined in advance for materials, labor, and overhead to value inventories and cost of goods sold.

Gross Profit

The excess of net sales over the cost of goods sold.