A job in an insurance office involves telephone conversationswith policyholders. The office manager estimates that...

A job in an insurance office involves telephone conversations with policyholders. The office manager estimates that about half of the employee’s time is spent on the telephone. How many observations are needed in a work sampling study to estimate that time percentage to within 4 percent and have a confidence of 95.5 percent? (Round z values to 2 decimal places. Do not round other intermediate calculations. Round your final answer to the nearest whole number.)

Number of observations

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Expert Solution

Z = number of standard deviations need.

= Sample proportion = 0.5 since half of the employees is mentioned

n = sample size

z value for 95.5/2 or 47.75 is 2.01

n = (2.01/0.04)² * 0.5 (1-0.5)

n = 631.265625

n = 631 observations

keosha answered 2 years ago

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