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About 71% of young adult Internet users ( ages 18 to 29) use social- networking sites. Suppose
that a sample survey contacts an SRS of 1500 young adult Internet users and calculates the
proportion p ˆ in this sample who use social-networking sites.
Solution
Sol) n=1500 and p=0.71
1) P hat =0.71
2) Mean=np =0.71*1500=1065
3) standard deviation of p hat =sqrt(pq/n)= 0.0117

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