TABLE 12-12
Recent Studies Have Found That American Children Are

question 201

Multiple Choice

TABLE 12-12
Recent studies have found that American children are more obese than in the past. The amount of time children spent watching television has received much of the blame. A survey of 100 ten-year-olds revealed the following with regards to weights and average number of hours a day spent watching television. We are interested in testing whether the average number of hours spent watching TV and weights are independent at 1% level of significance.
$\begin{array}{l|ccc|r} &{\text { TV Hours }} & \\\text { Weights } & 0-3 & 3-6 & 6+ & \text { Total } \\\hline \text { More than 10 lbs. Overweight } & 1 & 9 & 20 & 30 \\\text { Within 10 lbs. of normal weight } & 20 & 15 & 15 & 50 \\\text { More than 10 lbs. underweight } & 10 & 5 & 5 & 20 \\\hline \text { Total } & 31 & 29 & 40 & 100\end{array}$

-Referring to Table 12-12, what is the value of the test statistic?

• A) 15.483
• B) 69.744
• C) 18.889
• D) 8.532

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Definitions:

Correlation Coefficient

A statistical measure that calculates the strength and direction of a linear relationship between two variables.

Scientific Study

The pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence.

Exercise

Structured activities whose goal is to improve health.

Happiness

A state of well-being characterized by emotions ranging from contentment to intense joy.