SOLUTION: 4.)Suppose that 159 out of a random sample of 225 letters mailed in the United States were delivered the day after they were mailed. Based on this, compute a 99% confidence interva

Algebra ->  Probability-and-statistics -> SOLUTION: 4.)Suppose that 159 out of a random sample of 225 letters mailed in the United States were delivered the day after they were mailed. Based on this, compute a 99% confidence interva      Log On


   

Question 1177047: 4.)Suppose that 159 out of a random sample of 225 letters mailed in the United States were delivered the day after they were mailed. Based on this, compute a 99% confidence interval for the proportion of all letters mailed in the United States that were delivered the day after they were mailed. Then find the lower limit and upper limit of the 99%confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places.
Lower limit
Upper Limit
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
  x̄ = 159/225 = .7067
99%confidence interval
ME = z%2Asqrt%28%28p%281-p%29%29%2Fn%29

ME = 2.576%2Asqrt%28%28.7067%28.2933%29%29%2F225%29 =  .0782

 15.5 - .0782 < mu < 15.5 + .0782

CI: (15.42  , 15.58)

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