A Methods and Measurement Analyst Wants to Develop a Time

question 86

Multiple Choice

A methods and measurement analyst wants to develop a time standard for a certain task. In a preliminary study, he observed one worker perform the task six times with an average observed time of 20 seconds and a standard deviation of two seconds.
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?

• A) 3
• B) 4
• C) 13.3
• D) 16
• E) 25

---

Definitions:

Axle Shafts

Used to transmit drive torque between the differential carrier assembly and the drive wheels. Also known as half shafts and driveshafts.

Air-lift Axle

An additional axle for a vehicle, which can be lowered to spread the load over more wheels or raised when not needed.

Load Carrying

The capability of a structure or vehicle to bear weight or handle added stress.

Tire Scuffing

Tire scuffing is the wear or damage on tire surfaces caused by excessive friction from improper alignment, underinflation, or misapplication, leading to premature tire failure and decreased fuel efficiency.