Express the confidence interval in indicated format 0.45 < p < 0.67 in the form of p E.

Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p.

Of 346 items tested, 12 are found to be defective. Construct the 98% confidence interval for the proportion of all such items that are defective.

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 confidence level and sample data to find a confidence interval for estimating the population .

A laboratory tested 82 chicken eggs and found that the mean amount of cholesterol was 238 milligrams with = 19.4 milligrams. Construct a 95% confidence interval for the true mean cholesterol content, , of all such eggs.

Use the given information to find the minimum sample size required to estimate an unknown population mean .

How many students must be randomly selected to estimate the mean weekly earnings of students at one college? We want 95% confidence that the sample mean is within $2 of the population mean, and the population standard deviation is known to be $61.

Using the given degree of confidence and sample data to construct a confidence interval for the population mean . The population has a normal distribution.

A sociologist develops a test to measure attitudes towards public transportation, and 27 randomly selected subjects are given the test. Their mean score is 76.2 and their standard deviation is 21.4. Construct the 95% confidence interval for the mean score of all such subjects.