Find the indicated critical z value. Find the critical value zα/2 that corresponds to a 98% confidence level.

Find the indicated critical z value. Find the value of zα/2 that corresponds to a confidence level of 94%.

Find the indicated critical z value. Find zα/2 for α=0.08.

Express the confidence interval using the indicated format. Express the confidence interval 0.047 < p < 0.507 in the form of p^  ± E.

Express the confidence interval using the indicated format. Express the confidence interval (0.668, 0.822) in the form of p^ ± E.

The following confidence interval is obtained for a population proportion, p: (0.505, 0.545). Use these confidence interval limits to find the point estimate,  p^.

The following confidence interval is obtained for a population proportion, p: 0.537 < p < 0.563. Use these confidence interval limits to find the point estimate,  p^.

Assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. Round the margin of error to four decimal places. 95% confidence; n = 320, x = 60

Assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. Round the margin of error to four decimal places. 99% confidence; n = 6500, x = 1950

Assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. Round the margin of error to four decimal places. 98% confidence; the sample size is 890, of which 25% are successes

Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. n = 51, x = 27; 95% confidence

Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. n = 110, x = 55; 88% confidence

Use the given data to find the minimum sample size required to estimate the population proportion. Margin of error: 0.004; confidence level: 95%; p^ and q^ unknown

Use the given data to find the minimum sample size required to estimate the population proportion. Margin of error: 0.04; confidence level: 94%;  p^ and q^ unknown

Use the given data to find the minimum sample size required to estimate the population proportion. Margin of error: 0.05; confidence level: 99%; from a prior study, p^ is estimated by 0.15.

Use the given data to find the minimum sample size required to estimate the population proportion. Margin of error: 0.04; confidence level: 95%; from a prior study, p^ is estimated by the decimal equivalent of 89%.

Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. A survey of 865 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 95% confidence interval for the true proportion of all voters in the state who favor approval.

Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. A survey of 300 union members in New York State reveals that 112 favor the Republican candidate for governor. Construct the 98% confidence interval for the true population proportion of all New York State union members who favor the Republican candidate

Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. When 319 college students are randomly selected and surveyed, it is found that 120 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car.

A researcher is interested in estimating the proportion of voters who favor a tax on e-commerce. Based on a sample of 250 people, she obtains the following 99% confidence interval for the population proportion,  Which of the statements below is a valid interpretation of this confidence interval?