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:

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 2 seconds? Assume that the standard deviation of the task time is 4 seconds.
A)5
B)6
C)25
D)36
E)49

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:

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 2 seconds? Assume that the standard deviation of the task time is 4 seconds.
A)5 
B)6 
C)25 
D)36 
E)49

Quizplus · Accepted Answer

The Answer of 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:

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 2 seconds? Assume that the standard deviation of the task time is 4 seconds.
A)5 
B)6 
C)25 
D)36 
E)49

A Methods and Measurements Analyst Needs to Develop a Time