TABLE 11-12
Parents complain that children read too few storybooks and watch too much television nowadays. A survey of 1,000 children reveals the following information on average time spent watching TV and average time spent reading storybooks.

-Referring to Table 11-12, if the null hypothesis of no connection between time spent watching TV and time spent reading story books is true, how many children watching less than 2 hours of TV and reading no more than 2 hours of story books on average can we expect?
A) 35.69
B) 227.23
C) 262.91
D) 969.75

Question

TABLE 11-12
Parents complain that children read too few storybooks and watch too much television nowadays. A survey of 1,000 children reveals the following information on average time spent watching TV and average time spent reading storybooks.
 
-Referring to Table 11-12, if the null hypothesis of no connection between time spent watching TV and time spent reading story books is true, how many children watching less than 2 hours of TV and reading no more than 2 hours of story books on average can we expect?
A) 35.69 
B) 227.23 
C) 262.91 
D) 969.75

Quizplus · Accepted Answer

According to the table, 22.5% of children watch less than 2 hours of TV and read no more than 2 hours of storybooks on average. Out of 1,000 children, 22.5% is equal to:

0.225 x 1,000 = 225

Therefore, we can expect 225 children to fit this category on average. However, the question specifically asks for the average time spent by these children, not the count. Looking at the table again, we can see that among the children who watch less than 2 hours of TV and read no more than 2 hours of storybooks, the average time spent reading is 1.17 hours and the average time spent watching TV is 1.47 hours. Therefore, we can expect:

225 x (1.17 + 1.47)/2 = 262.91 children on average who watch less than 2 hours of TV and read no more than 2 hours of storybooks.

So, the correct answer is option C.

TABLE 11-12 Parents Complain That Children Read Too Few Storybooks and Watch