A methods and measurements analyst for Timepiece, Inc., needs to develop a time standard for the task of attaching a watch to a wristband. 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 he wants to be 95.44 percent confident that the maximum error in the observed time is 1 second? Assume that the standard deviation of the task time is 5 seconds.
A)5
B)10
C)25
D)100
E)121

Question

A methods and measurements analyst for Timepiece, Inc., needs to develop a time standard for the task of attaching a watch to a wristband. 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 he wants to be 95.44 percent confident that the maximum error in the observed time is 1 second? Assume that the standard deviation of the task time is 5 seconds.
A)5 
B)10 
C)25 
D)100 
E)121

Quizplus · Accepted Answer

The Answer of A methods and measurements analyst for Timepiece, Inc., needs to develop a time standard for the task of attaching a watch to a wristband. 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 he wants to be 95.44 percent confident that the maximum error in the observed time is 1 second? Assume that the standard deviation of the task time is 5 seconds.
A)5 
B)10 
C)25 
D)100 
E)121

A Methods and Measurements Analyst for Timepiece, Inc