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Chi Square

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Recent studies have found that American children are more obese than in the past. The amount of time children spent watchitg television has received much of the blame. A survey of 100 ten-year-olds revealed the following data as shown in the table below with regard 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 the child's weight are independent at 1% level of significance.

TV Hours
0- 3- 6+
Weight 3 6 Total
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More than 10 lbs. 1 9 20 30
overweight
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Within 10 lbs. 20 15 15 50
of normal weight
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More than 10 lbs. 10 5 5 20
underweight
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Total 31 29 40 100

Referring to the table above, if there is no connection between weight and average number of hours spent watching TV, we should expect how many children to be spending 3-6 hours on average watching TV and who are more than 10 lbs. underweight?

a. 5
b. 5.8
c. 6.2
d. 8

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Answers a multiple choice question on a chi square contingency table.

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