TABLE 12-12
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.

-Referring to Table 12-12, how many children in the survey spend no more than 6 hours watching TV and are more than 10 lbs. underweight?
A) 5
B) 10
C) 15
D) 20

Question

TABLE 12-12
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.
 
-Referring to Table 12-12, how many children in the survey spend no more than 6 hours watching TV and are more than 10 lbs. underweight?
A) 5 
B) 10 
C) 15 
D) 20

Quizplus · Accepted Answer

In order to find the number of children who spend no more than 6 hours watching TV and are more than 10 lbs. underweight, we need to look at the intersection of the categories "TV Watching per Day" of "0-6" and "Weight Category" of "10 or More Pounds Underweight". According to the table, there are 15 children in this intersection, so the answer is (C) 15.

TABLE 12-12 Recent Studies Have Found That American Children Are More Obese