Chapter 12, Problem AP4.9CPT

To determine

To find out how many females do you expect to choose LinkedIn.

Answer to Problem AP4.9CPT

Option (e) is the correct option.

Explanation of Solution

It is assumed that gender and preferred networking site are independent. The responses of the genders over the social networking sites are given in the table in the question. We note that the row total of “LinkedIn” is $195$ and the column total of “Female” is $477$ , while the table total is $900$ . The expected frequencies, when the gender and preferred networking site are independent, are the product of the column and row total, divided by the table total.

  $\begin{array}{l}E=\frac{r\times c}{n}\\ =\frac{195\times 477}{900}\\ =\frac{93015}{900}\\ =103.35\end{array}$

Thus, the option (e) is the correct option.