A Manager Wants to Determine the Proportion of Time a Cashier

question 105

Multiple Choice

A manager wants to determine the proportion of time a cashier is idle. A work sampling method was used, and the idle time was found to be 20 percent based on 100 observations. If the manager wants a + 0.05 with a 95 percent confidence level (z = 1.96) , how many MORE observations are needed?

• A) fewer than or equal to 200
• B) greater than 200 but fewer than or equal to 300
• C) greater than 300 but fewer than or equal to 400
• D) greater than 400

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