An analyst has observed a job long enough to become familiar with it and has divided it into five elements. The element times for the first four cycles and a performance rating for each element are given in the following table.

(a) Do any of the times look like “outliers,” that is, probable errors in reading or recording data that should not be included in the analysis?

(b) Compute an estimated normal time for the job based on the data available at this stage of the study.

(c) On the basis of the data available, what size sample should be taken to estimate the time for element 2 within 5 percent of the true mean time with 95 percent confidence?

Transcribed Image Text:

CYCLE CYCLE CYCLE CYCLE ELEMENT 1 2 3 PERFORMANCE RATING (PERCENT) 1 1.246 1.328 1.298 1.306 90 2 0.972 0.895 0.798 0.919 100 3 0.914 1.875 1.964 1.972 100 4 2.121 2.198 2.146 2.421 110 5 1.253 1.175 1.413 2.218 100