Instruction 15-13
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.
| Average time spent reading story books |
$$\begin{array} { | l | c | c | c | }
\hline \begin{array} { l }
\text { Average time spent } \
\text { watching TV }
\end{array} & \begin{array} { c }
\text { Less than } \
1 \text { hour }
\end{array} & \begin{array} { c }
\text { Between } \
1 \text { and 2 hours }
\end{array} & \begin{array} { c }
\text { More than } \
2 \text { hours }
\end{array} \
\hline \text { Less than } 2 \text { hours } & 90 & 85 & 130 \
\hline \text { More than 2 hours } & 655 & 32 & 8 \
\hline
\end{array}$$
-Referring to Instruction 15-13,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 you expect?
A) 35.69
B) 969.75
C) 262.91
D) 227.23

Question

Instruction 15-13
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.
| Average time spent reading story books |
 $$\begin{array} { | l | c | c | c | } 
\hline \begin{array} { l } 
\text { Average time spent } \
\text { watching TV }
\end{array} & \begin{array} { c } 
\text { Less than } \
1 \text { hour }
\end{array} & \begin{array} { c } 
\text { Between } \
1 \text { and 2 hours }
\end{array} & \begin{array} { c } 
\text { More than } \
2 \text { hours }
\end{array} \
\hline \text { Less than } 2 \text { hours } & 90 & 85 & 130 \
\hline \text { More than 2 hours } & 655 & 32 & 8 \
\hline
\end{array}$$
-Referring to Instruction 15-13,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 you expect?
A) 35.69
B) 969.75
C) 262.91
D) 227.23

Quizplus · Accepted Answer

To calculate the expected number of children watching less than 2 hours of TV and reading no more than 2 hours of story books, we need to use the formula for expected frequencies:
Expected frequency = (Row total x Column total) / Grand total

The row total for children watching less than 2 hours of TV is 138, and the column total for children reading no more than 2 hours of story books is 136. The grand total is 1000. Therefore, the expected frequency is:

Expected frequency = (138 x 136) / 1000 = 18.768

Rounding this to the nearest whole number, we get an expected frequency of 19. Therefore, we can expect around 19 children to watch less than 2 hours of TV and read no more than 2 hours of story books on average.

Instruction 15-13 Parents Complain That Children Read Too Few Storybooks

Instruction 15-13
Parents Complain That Children Read Too Few Storybooks