Industrial engineers periodically conduct “work measurement" analyses to determine the time required to produce a single unit of output. At a large processing plant, the number of total worker- hours...

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Extracted text: Industrial engineers periodically conduct “work measurement" analyses to determine the time required to produce a single unit of output. At a large processing plant, the number of total worker- hours required per day to perform a certain task was recorded for 50 days. Measurements in excess of 120 worker-hours include repair activities. The data are shown below: 128 119 97 98 95 124 132 124 128 142 108 120 113 146 109 97 138 109 133 136 111 120 112 128 103 135 114 100 131 113 124 88 117 118 122 131 133 131 116 98 112 138 100 112 111 165 97 116 92 122 1. Construct a stem-and-leaf display of the data and comment on any important features that you notice. 2. Construct the intervals y± S, y± 2S, y±3S. Count the number of observations that fall within each interval and find the corresponding proportions. Compare the results to the empirical rule and comment on the results. 3. Construct a box plot for the data. Do you detect any outliers?