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A random sample of 900 students at a very large university was asked which

Chapter 12, Problem AP4.9

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QUESTION:

A random sample of 900 students at a very large university was asked which social-networking site they used most often during a typical week. Their responses are shown in the table below. Assuming that gender and preferred networking site are independent, how many females do you expect to choose LinkedIn? (a) 18.85 (c) 87.00 (e) 103.35 (b) 46.11 (d) 91.65 AP4

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QUESTION:

A random sample of 900 students at a very large university was asked which social-networking site they used most often during a typical week. Their responses are shown in the table below. Assuming that gender and preferred networking site are independent, how many females do you expect to choose LinkedIn? (a) 18.85 (c) 87.00 (e) 103.35 (b) 46.11 (d) 91.65 AP4

ANSWER:

Step 1 of 4

We need to calculate the expected number of females who use Linkedln. To calculate the expected number of females who use Linkedln, we need to use the following formula

.

where:

-  is the sample size,

- P( Female and LinkedIn ) is the probability of female using Linkedln.

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