In a survey of 800 senior business executives by Business Week magazine, 55% indicated that they felt that even if merit and abilities are equal, people with MBAs often get promoted faster than people without the degree. Prepare a 92% confidence interval estimate for the population proportion.

92% CI = to

You receive 95 yes responses on a survey of 347 people (n).

(Round your answers to two decimal places. Example: 1.51)

a. What is the point estimate of the proportion of the population (p) that would say yes?

b. Estimate the standard error of the population proportion.

c. Determine the 95% confidence interval.

A random sample of the diameters in inches of 25 large oak trees has a mean of 65 and a standard deviation of 4. The population is known to be normal but its standard deviation, , is not known.

a. Develop a 90% confidence interval for the population mean (Round to 2 decimal places. Example: 3.87)

b. Develop a 95% confidence interval for the population mean (Round to 2 decimal places. Example: 3.87)

c. Develop a 99% confidence interval for the population mean (Round to 2 decimal places. Example: 3.87)

You want to develop a 90% confidence interval with a margin of error of 7.

If the population standard deviation is 43, what size sample do you need?

A personnel manager is conducting a study of sales supervisory salaries in this industry. A survey for the salaries of 36 sales supervisors found a mean of $39.31 thousand and a standard deviation of $18.32 thousand. Determine a 98-percent confidence interval (in thousands of dollars) for the mean of all sales supervisory salaries in this industry.

98% CI = to

With = 7, a 90% confidence interval for a population mean was 100 to 103.5.

(Round to 2 decimal places. Example: 3.87)

Determine the sample size.

92% CI = to

You receive 95 yes responses on a survey of 347 people (n).

(Round your answers to two decimal places. Example: 1.51)

a. What is the point estimate of the proportion of the population (p) that would say yes?

b. Estimate the standard error of the population proportion.

c. Determine the 95% confidence interval.

A random sample of the diameters in inches of 25 large oak trees has a mean of 65 and a standard deviation of 4. The population is known to be normal but its standard deviation, , is not known.

a. Develop a 90% confidence interval for the population mean (Round to 2 decimal places. Example: 3.87)

b. Develop a 95% confidence interval for the population mean (Round to 2 decimal places. Example: 3.87)

c. Develop a 99% confidence interval for the population mean (Round to 2 decimal places. Example: 3.87)

You want to develop a 90% confidence interval with a margin of error of 7.

If the population standard deviation is 43, what size sample do you need?

A personnel manager is conducting a study of sales supervisory salaries in this industry. A survey for the salaries of 36 sales supervisors found a mean of $39.31 thousand and a standard deviation of $18.32 thousand. Determine a 98-percent confidence interval (in thousands of dollars) for the mean of all sales supervisory salaries in this industry.

98% CI = to

With = 7, a 90% confidence interval for a population mean was 100 to 103.5.

(Round to 2 decimal places. Example: 3.87)

Determine the sample size.

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