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A random sample of 900 students at a very large university was asked which
Chapter 12, Problem AP4.9(choose chapter or problem)
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
Questions & Answers
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.