Consider the recorded observations of 10 cycles of the cup packaging operation, shown in Figure H.4.
a. Determine the select times for each work element, the normal time for the cycle, and the standard time per package.
b. Suppose that we want a sample size that gives an average time within ±5 percent of the true average 95 percent of the time. Did we make enough observations?
If not, how many more should we make?
c. Suppose that all we wanted was a precision of ±10 percent. How many additional observations would we need?

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TABLE H.4 TIME STUDY RESULTS OF THE PACKAGE FILLING OPERATION OBSERVATION Work Element 3 9. 4 8 10 11 12 RF 1. Fill bag 0.21 0.22 0.25 0.20 0.22 0.24 0.18 0.20 0.19 0.24 0.18 0.19 1.00 1.2 0.37 2. Sew closed 0.37 0.41 0.41 0.39 0.40 0.38 0.40 0.36 0.41 0.42 0.36 1.00 0.8 3. Transport 0.85 0.33 0.84 0.73 0.82 1.1