Question

This Quiz: 2 pts possib This Question: 1 pt 1 of 2 (0 complete) According to a recent survey, 76% of teens ages 12-17 in parts a throughd below. certain country used social networks in 2009. A random sample of 120 teenagers from this age group was selected. Complete a. Calculate the standard error of the proportion. (Round to four decimal places as needed.) b. What is the probability that less than 78% of the teens from this sample used social networks? P(Less than 78% of the teens from this sample used social networks) (Round to four decimal places as needed.) c. What is the probability that between 70% and 80% of the teens from this sample used social networks? P(Between 70% and 80% of the teens from this sample used social networks) (Round to four decimal places as needed.) d. What impact would changing the sample size to 200 teens have on the results of parts a, b, and c? Choose the correct answer below. O A. The standard error would be increased, which would, in turn, reduce the probabilities that the sample proportions will be closer to the population proportion. O B. The standard error would be reduced, which would, in turn, reduce the probabilities that the sample proportions will be closer to the population proportion. O C. The standard error would be increased, which would, in turn, increase the probabilities that the sample proportions will be closer to the population proportion. O D. The standard error would be reduced, which would, in turn, increase the probabilities that the sample proportions will be closer to the population proportion. OE. Chanaina the sample size would have no effect on the standard error or the probabilities that the samole proportions will be closer to the poDulation oroDortion.

Answer 1

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