Question: 3. The continuous timing method in direct time study was used to obtain the element times for a worker-machine task as indicated in the table

3. The continuous timing method in direct time

3. The continuous timing method in direct time study was used to obtain the element times for a worker-machine task as indicated in the table below. Element c is a machine controlled element and the time is constant. Elements a, b, d, e, and f are operator-controlled and external to the machine cycle, and they were performance rated at 80%. If the machine allowance is 25%, and the worker PFD allowance is 15%, Determine (a) the normal time (b) the standard time for the cycle, and (c) the worker's efficiency if the worker completes 360 work units working 7.2 hr on an 8-hour shift. element b d e f .18 30 .88 1.12 Observed time 1.55 1.80 Normal Time Tn = T obs. (PR) Standard time T std. = Tn (1+ A pfd) Standard Time (work - machine) T std = T nw ( 1 +A pfd) + Tm (1 + Am) Confidence interval Pr (Te lies within x prom. z a/2 o/ raiz cuadrada n) = (1-a) Standard deviation S = (raiz cuadrada) (x - x prom.)^2 / n-1 Confidence interval size Pr (Te lies within x prom. Ita/2 s/ raiz cuadrada n) = (1-x) Interval size x prom. = kx. prom. Cycles n n= (t a/2 s/kx prom.) ^2 =

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