Question 9 3 pts TABLE 11-12 Recent studies have found that American children ar

Question

Question 9 3 pts TABLE 11-12 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. TV Hours 0-3 3-6 6 Total 30 50 20 100 More than 10 lb. overweight 20 thin 10 lb, of normal weight More than 10 lb. underweight Total 20 10 31 15 15 29 40 Referring to Table 11-12, if there is no connection between weights 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 are more than 10 lb. underweight? O 62 05 OSB acBook

Explanation / Answer

for no connection these categories should be independent:

therefore expected number of children =row total*column total/grand total =20*29/100=5.8

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