A Work-Sampling Method Is Used to Determine the Proportion of the Time

question 85

Multiple Choice

A work-sampling method is used to determine the proportion of the time a worker is idle.The following information was gathered on a random basis.
$$\begin{array} { | c | c | c | } \hline \text { Day } & \begin{array} { c } \text { No. Times } \\\text { Clerk Idle }\end{array} & \begin{array} { c } \text { Total No. } \\\text { Observations }\end{array} \\\hline \text { Monday } & 4 & 13 \\\text { Tuesday } & 2 & 8 \\\text { Wednesday } & 4 & 10 \\\text { Thursday } & 2 & 10 \\\hline\end{array}$$
If the manager wants a 95 percent confidence level and a degree of precision of ± 0.03,how many more observations are needed?

• A) Fewer than or equal to 600
• B) Greater than 600 but fewer than or equal to 800
• C) Greater than 800 but fewer than or equal to 1,000
• D) Greater than 1,000

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