A production job was being timed to determine a baseline measure of the productivity of the job.?

... The following times were taken for 5 cycles of the job.

Cycle
Assembly Time
(in hundredths)
1
12
2
14
3
13
4
12
5
14
Average Time =

If the standard deviation of the assembly times is 1, approximately how many samples need to be taken to be 95% sure (Z=1.96) that the accuracy of the time study is within 5% of the true mean value.
6
9
15

IncorrectQuestion 8
0 / 2 pts
Regardless of whether enough samples were taken to insure the correct accuracy in the problem above, answer the following questions assuming that enough samples were taken and that the average and standard deviation given (or calculated) are good estimators.

While observing the employee performing the task above, the employee was given a performance rating of 90% while the company generally grants a 20% allowance for PDF (personal, fatigue, and delay) allowances.

What would be the “normal time” for the task?
11.7 or .117 minutes
14.44 or .1444 minutes
14.04 or .1404 minutes

IncorrectQuestion 9
0 / 2 pts
What would be the “standard time” for the task?
11.7 or .117 minutes
14.44 or .1444 minutes
14.04 or .1404 minutes

IncorrectQuestion 10
0 / 2 pts
What would be the production rate for the job for 8 hours (480 minutes = an 8 hour day)?
4,102 units/day
41.02 units/day
3,418 units/day