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 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. (If necessary, consult a list of formulas.)

A newsgroup is interested in constructing a 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative. Of the 571 randomly selected Americans surveyed, 444 were in favor of the initiative. Round answers to 4 decimal places where possible. a. With 90% confidence the proportion of all Americans who favor the new Green initiative is between and b. If many groups of 571 randomly selected Americans were surveyed, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population proportion of Americans who favor the percent will not contain the true population proportion. Green initiative and about Submit Question

A newsgroup is interested in constructing a 95% confidence interval for the proportion of all Americans who are in favor of a new Green initiative. Of the 533 randomly selected Americans surveyed, 437 were in favor of the initiative. Round answers to 4 decimal places where possible. a. With 95% confidence the proportion of all Americans who favor the new Green initiative is between and percent of these b. If many groups of 533 randomly selected Americans were surveyed, then a different confidence interval would be produced from each group. About confidence intervals will contain the true population proportion of Americans who favor the Green initiative and about percent will not contain the true population proportion.

In a sample of  300  college seniors,  252  responded positively when asked if they have spring fever. Based upon this, compute a  95%  confidence interval for the proportion of all college seniors who have spring fever. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. What is the lower limit of the  95%  confidence interval?   What is the upper limit of the  95%  confidence interval?