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:

Beck Depression Inventory

A self-report questionnaire used to assess the severity of depressive symptoms in adolescents and adults.

Antidepressant

A type of medication designed to alleviate symptoms of depression by adjusting chemical imbalances of neurotransmitters in the brain.

Independent Variable

The factor in an experiment that is intentionally changed or manipulated to observe its effects on the dependent variable.

Statistical Analyses

The process of collecting, examining, summarizing, and interpreting data to discover patterns and trends, often for the purpose of making a decision or testing a hypothesis.