A Methods and Measurements Analyst for Timepiece,Inc

Multiple Choice

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 employees 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 one second? The standard deviation of task times is 5 seconds.

A) 5
B) 10
C) 25
D) 100
E) 121