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# 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,

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).
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.

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...

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