Mathematics, 18.05.2021 19:00 naiomireyes74p2aybs
Suppose that 158 out of a random sample of 200 letters mailed in the United States were delivered the day after they were mailed. Based on this, compute a 90% 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 90% confidence interval.
Answers: 1
, and a confidence level of 
, we have the following confidence interval of proportions.
.
, z is the value of Z that has a p-value of 
, so 
. 
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Suppose that 158 out of a random sample of 200 letters mailed in the United States were delivered th...
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