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Instruction 15-14
Recent Studies Have Found That Australian Children Are

question 108

Multiple Choice

Instruction 15-14
Recent studies have found that Australian 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. You are interested in testing whether the average number of hours spent watching TV and weights are independent at 1% level of significance.
| TV Hours |
 Weights 03366+ Total  More than 10 kg overweight 192030 Within 10 kg of normal weight 20151550 More than 10 kg underweight 105520 Total 312940100\begin{array} { | l | c | c | c | c | } \hline \text { Weights } & 0 - 3 & 3 - 6 & 6 + & \text { Total } \\\hline \text { More than 10 kg overweight } & 1 & 9 & 20 & 30 \\\hline \text { Within 10 kg of normal weight } & 20 & 15 & 15 & 50 \\\hline \text { More than 10 kg underweight } & 10 & 5 & 5 & 20 \\\hline \text { Total } & 31 & 29 & 40 & 100 \\\hline\end{array}
-Referring to Instruction 15-14,the degrees of freedom of the test statistic are


Definitions:

Dependent Variable

In research, it's the variable that is being tested and measured, expected to change as a result of manipulations to the independent variable.

Manipulated

Refers to the controlled alteration or handling of variables in experiments to determine cause-and-effect relationships.

Placebo Effect

The phenomenon that occurs in an experiment when a participant’s response to a treatment is due to his or her expectations about the treatment rather than to the treatment itself.

Sugar Pill

A placebo, often used in medical trials to test the efficacy of new drugs by comparing their effects to those of an inert pill.

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