A methods and measurements analyst needs to develop a time standard for a certai
ID: 393054 • Letter: A
Question
A methods and measurements analyst needs to develop a time standard for a certain task. In a preliminary study, he observed one of his workers perform this task five times, with the following results:
Observation --- 1 --- 2 --- 3 --- 4 --- 5
Time(seconds) 84 ---76 --80 --84 --76
How many observations should be made if the analyst wants to be 99.74 percent confident that the maximum error in the observed time is two seconds? Assume that the standard deviation of the task time is four seconds.
A. 25
B. 6
C. 49
D. 5
E. 36
Explanation / Answer
Number of observations needed, n = (z *s / h) ^2
Where,
z = number of std. dev. needed for desired confidence level of 99.74% = 3
s = Standard Deviation of task = 4 seconds
h = maximum error in the observed time = 2 second
Therefore,
n = (3*4/ 2) ^2
= (12/2) ^2
= 6^2 = 36 observations
Therefore correct answer is option E. 36
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