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In: Operations Management

A job in an insurance office involves telephone conversations with 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 3 percent and have a confidence of 99.0 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            

Solutions

Expert Solution

Answer: - According to given data

Formula to calculate the number of observation (n) = (z/e)² * p(1-p)

Where Z value obtained from given confidence interval = 2.58

E = accuracy = 0.03

P = percentage of time = 0.50

Number of observations = (2.58/0.03)² * 0.50(1-0.50) = 7396 * 0.25 = 1849

keosha answered 2 years ago
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