Over half of all American teens (ages 12 to 17 years) have an online profile, mainly...

Over half of all American teens (ages 12 to 17 years) have an online profile, mainly on Facebook. A random sample of 517 teens with profiles found that 399 included photos of themselves.

(a) Give the 99% 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 99% confidence interval for p . (The plus-four interval always pulls the results away from 0% or 100%, whichever is closer. Even though the condition for using the large-sample interval is met, the plus four interval is more trustworthy.)
Plus four Interval: to

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orchestra answered 2 years ago

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Over half of all American teens (ages 12 to 17 years) have an online profile, mainly...

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