Confidence Interval for The Proportion

(2 points) Over half of all American teens (ages 12 to 17 years) have an online profile, mainly on Facebook. A random sample of 513 teens with profiles found that 404 included photos of themselves. (a) Give the 90% large-sample confidence interval for the proportion p of all teens with profiles who include photos of themselves. Large-sample Interval: to (b) Give the plus four 90% confidence interval for p . (The plus-four interval always pulls the results away from 0% or100%, whichever is closer. Even though the condition for using the large-sample interval is met, the plus four intervals more trustworthy.) Plus four Interval: to l:

Confidence Interval for The Proportion 1

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