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# krm8_ism_h - Supplement H Measuring Output Rates PROBLEMS 1...

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Supplement H Measuring Output Rates PROBLEMS 1. A machine shop a. Normal time per cycle = (Average observed time)(Rating factor) The average observed time is: (40 + 48 + 48 + 46 + 42)/5 = 44.80 min./operation The normal time per cycle is then: ( )( )=(44.80)(1)(0.95)=42.56 = NTC t F RF min. b. Standard time = Normal time for the cycle (1.0 + allowance): ( 29 ( 29 1.0 42.56 1 0.15 48.94 min. ST NTC A = + = + = 2 Stetson and Stetson Company a. Normal time per cycle = (Average observed time)(Rating factor) The average observed time is: (0.40 + 0.20 + 0.31 + 0.15 + 1.25) = 2.31 minutes NTC = (2.31)(1.00) = 2.31 min. ST = (2.31)(1.18) = 2.7258 min. b. Sample size necessary for 95 percent confidence, i.e., z = 1.96 and error of " 3 percent: For work element 1: 2 1.96 0.021 11.76 0.03 0.400  = =   n For work element 2: 2 1.96 0.011 12.91 0.03 0.200  = =   n For work element 3: 2 1.96 0.018 14.39 0.03 0.310  = =   n For work element 4: 2 1.96 0.005 4.74 0.03 0.150  = =   n For work element 5: 2 1.96 0.085 19.73 0.03 1.250  = =   n c. Sample size of 20 is adequate.

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243 l SUPPLEMENT H 3. Bill’s Fast-Food Restaurant Work Element 1 2 3 4 5 t RF F NT 1 0.45 0.41 0.50 0.48 0.36 0.44 0.9 1 0.396 2 0.85 0.81 0.77 0.89 0.83 0.83 1.2 1 0.996 3 0.60 0.55 0.59 0.58 0.63 0.59 1.2 1 0.708 4 0.31 0.24 0.27 0.26 0.32 0.28 1.0 1 0.280 Normal time per cycle ( NTC ), in minutes per burger = 2.380 Standard time = Normal time per cycle (1.0 + allowance) ( 29 ( 29 1.0 2.380 1.0 0.15 2.737 min. unit ST NTC A = + = + = Employees needed = 300(2.737)/190 = 4.322 or 5 employees (The employees will have some slack time.) 4. Bill’s Fast-Food Restaurant, continued a. Work element 3, select time 0.45 0.31 0.50 0.48 0.39 0.31 0.44 0.29 0.33 0.40 0.390 10 + + + + + + + + + = = t Revised normal time: 0.390 (1) (1.2) = 0.468 b. Revised normal time per cycle. Work Element NT 1 0.396 2 0.996 3 0.468 4 0.280 Normal time per cycle, ( NTC ) = 2.140 min./burger Revised standard time per cycle ( 29 ( 29 1.0 2.140 1.0 0.15 2.461 min. burger ST NTC A = + = + = c. Sample size for work element 3,—98 percent confident to be within ± 13 percent ( 29 ( 29 2 2 0.468 0.077 1 9 σ - - = = = - i i t t t n 2 2 2.33 0.077 8.7 0.13 0.468  = = =    z n p t 9 = n , therefore enough observations have been already made.
Measuring Output Rates l SUPPLEMENT H l 244 d. Number of employees required when 3rd work element is inflated by 13%. Standard time (3rd work element time is increased by 13%).

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krm8_ism_h - Supplement H Measuring Output Rates PROBLEMS 1...

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