Instruction 15-11
Recent Studies Have Found That Australian Children Are

question 44

Multiple Choice

Instruction 15-11
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 |
$$\begin{array} { | l | c | c | c | c | } \hline \text { Weights } & 0 - 3 & 3 - 6 & 6 + & \text { Total } \\\hline \text { More than } 10 \text { kg overweight } & 1 & 9 & 20 & 30 \\\hline \text { Within } 10 \mathrm {~kg} \text { of normal weight } & 20 & 15 & 15 & 50 \\\hline \text { More than } 10 \mathrm {~kg} \text { underweight } & 10 & 5 & 5 & 20 \\\hline \text { Total } & 31 & 29 & 40 & 100 \\\hline\end{array}$$
-Referring to Instruction 15-11,suppose the value of the test statistic was 30.00 (which is not the correct value) and the critical value at 1% level of significance was 10.00 (which is not the correct value) ,which of the following conclusions would be correct?

• A)You will accept the null and conclude that mean number of hours spent watching TV and weights are independent.
• B)You will reject the null and conclude that mean number of hours spent watching TV and weights are not independent.
• C)You will accept the null and conclude that mean number of hours spent watching TV and weights are not independent.
• D)You will reject the null and conclude that mean number of hours spent watching TV and weights are independent.

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