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A study of the career paths of hotel general managers sent questionnaires to an SRS of...

A study of the career paths of hotel general managers sent questionnaires to an SRS of 220 hotels belonging to major U.S. hotel chains. There were 99 responses. The average time these 99 general managers had spent with their current company was 9.02 years. (Take it as known that the standard deviation of time with the company for all general managers is 2.3 years.)

(a) Find the margin of error for an 85% confidence interval to estimate the mean time a general manager had spent with their current company:  years

(b) Find the margin of error for a 99% confidence interval to estimate the mean time a general manager had spent with their current company:  years

(c) In general, increasing the confidence level  the margin of error (width) of the confidence interval. (Enter: ''DECREASES'', ''DOES NOT CHANGE'' or ''INCREASES'', without the quotes.)

Math   Statistics-And-Probability   
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