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

question 128

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,if there is no connection between weights and mean number of hours spent watching TV,how many children should you expect to be spending no more than 6 hours on average watching TV and are more than 10 kg underweight?

• A)5.8
• B)8
• C)6.2
• D)12

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Definitions:

β-methoxybutyraldehyde

An organic compound, specifically an aldehyde with a methoxy group in the beta position relative to the aldehyde function.

Methoxy

A functional group characterized by the presence of an oxygen atom bonded to a methyl group (-OCH3).

IUPAC Name

The systematic and standardized name of a chemical compound, as designated by the International Union of Pure and Applied Chemistry.

Proton NMR

A type of nuclear magnetic resonance spectroscopy that specifically studies the magnetic properties of hydrogen-1 isotopes in molecules to infer structure.