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Over half of all American teens (ages 12 to 17 years) have an online profile, mainly on Facebook. A random sample of 527 teens with

Over half of all American teens (ages 12 to 17 years) have an online profile, mainly on Facebook. A random sample of 527 teens with profiles found that 342 included photos of themselves.

(a) Give the 96% 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 96% 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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