A Pilot Work Study Has Been Conducted on a New

Essay

A pilot work study has been conducted on a new operation with four work elements.The following times,in seconds,were obtained using the continuous method.
$$\begin{array} { c } { \text { Observations } } \\\begin{array} { | c | c | c | c | c | c | c | } \hline \text { Element } & 1 & 2 & 3 & 4 & 5 & R F \\1 & 11.00 & 45.00 & 80.00 & 117.00 & 153.00 & 1.10 \\2 & 20.00 & 54.00 & 89.00 & 125.00 & 161.00 & 1.05 \\3 & 25.00 & 58.00 & 95.00 & 131.00 & 166.00 & 0.85 \\\hline\end{array}\end{array}$$
a.What is the normal time for this operation?
b.If an allowance of 20 percent is used,what is the standard time for this task?
c.What sample size is appropriate for estimating the time for element 3 within ± 3 percent of the true mean time with 95 percent confidence?