Based on a careful work study in the Richard Dulski Corp., the results shown in the followinf table have been observed:
Element Performance Rating 1 2 3 4 5
Prepare daily reports 125% 36 40 32 41 38
Photocopy results 105% 13 10 35a 15 14
Label and package reports 90% 3 4 5 4 5
Distribute reports 80% 16 17 22 18 46b
(a)Photocopying machine broken; included as delay in the allowance factor
(b)Power outage; included as adelay in the allownace factor
1. Compute the normal time for each element.
2. If the allowance for this type work is 12%, what is the standard tme?
3. How many observations are needed for a 95% confidence level within 5% accracy? (Hint Calculate the sample size of each element.)