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Chapter 12: Q.AP4.9 - Cumulative AP Practise Test (page 828)

A random sample of 900students at a very large university was asked which social networking site they used most often during a typical week. Their responses are shown Page Number: 828in the table

Assuming that gender and preferred networking site are independent, how many females do you expect to choose LinkedIn?

a.87.00

b.90.00

c.95.40

d.97.50

e.103.35

Short Answer

Expert verified

The number of females expect to choose LinkedIn is

e.103.35

Step by step solution

01

Given information 

Given in the question that, A random sample of 900students at a very large university was asked which social networking site they used most often during a typical week. Their responses are shown Page Number: 828in the table.


We need to find that the number of females expect to choose LinkedIn if gender and preferred networking site are independent .

02

Explanation

Gender and favourite social networking site are thought to be unrelated. In the inquiry, the gender replies to social networking sites are listed in a table. The total number of rows in "Linkedln" is195, and the total number of columns in "Female" is 477, whereas the total number of rows in the table is 900.When the gender and favourite networking site are independent, the expected frequencies are the product of the column and row totals divided by the table total.

E=r×cn

=195×477900

=93015900

=103.35

The correct option is (e)

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