A Methods and Measurements Analyst needs to develop a time standard for a certain task. The task involves use of ruler, square, and portable electric saw to mark and cut the "notch" in a rafter (a standard carpentry task of home construction). In a preliminary study, he observed one of his workers perform this task five times. The observations were made in an air-conditioned, well-lighted training facility, at ground level, with all tools and equipment clean and readily available.
$8274808376\begin{array} { | l | l | l | l | l | l | } \hline \text { observation: } & 1 & 2 & 3 & 4 & 5 \\\hline \text { Task time (seconds): } & 82 & 74 & 80 & 83 & 76 \\\hline\end{array}$ a. What is the actual average time for this task?
b. What is the normal time for this task if the employee worked at a 20% faster pace than is typical for adequately trained workers?
c. What is standard time for this task if allowances are 8% constant and 6% variable?
d. If the analyst then thought more carefully about his experiment, and decided that the variable allowances needed to be increased to match the real (outside, unair-conditioned) work environment, and that the proper variable allowance was not 6% but 12%, what is the revised standard time?

Question

A Methods and Measurements Analyst needs to develop a time standard for a certain task. The task involves use of ruler, square, and portable electric saw to mark and cut the "notch" in a rafter (a standard carpentry task of home construction). In a preliminary study, he observed one of his workers perform this task five times. The observations were made in an air-conditioned, well-lighted training facility, at ground level, with all tools and equipment clean and readily available.

8274808376\begin{array} { | l | l | l | l | l | l | } \hline \text { observation: } & 1 & 2 & 3 & 4 & 5 \\\hline \text { Task time (seconds): } & 82 & 74 & 80 & 83 & 76 \\\hline\end{array}

a. What is the actual average time for this task?
b. What is the normal time for this task if the employee worked at a 20% faster pace than is typical for adequately trained workers?
c. What is standard time for this task if allowances are 8% constant and 6% variable?
d. If the analyst then thought more carefully about his experiment, and decided that the variable allowances needed to be increased to match the real (outside, unair-conditioned) work environment, and that the proper variable allowance was not 6% but 12%, what is the revised standard time?

KELLIE CLOUTIER · Accepted Answer

Final Answer :

a. Actual average time is 79 seconds. b. Normal time is 79 × 1.20 = 94.8 seconds.
c. Standard time is 94.8 / (1 - .14) = 110.23 seconds. d. The revised standard time is
94.8 / (1 - .20) = 118.5 seconds.

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