Recitation VIII Regression Spring 09

Recitation VIII Regression Spring 09 - Stat 201 Recitation...

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0 20 40 60 80 100 120 140 160 180 0 20 40 60 80 100 Lot Size Worker-Hours Stat 201 Recitation Worksheet: Regression Analysis A company that manufacturers machine parts would like to develop a model to estimate the number of worker-hours required for production runs of varying lot size. A random sample of 14 production runs (2 each of lot sizes 20, 30, 40, 50, 60, 70, and 80) is selected with the following results: Lot Size (x) Worker-Hours (y) Lot Size Worker-Hours 20 50 50 112 20 55 60 128 30 73 60 135 30 67 70 148 40 87 70 160 40 95 80 170 50 108 80 162 Note that: . (a) Find the equation of the sample regression line. (b) Use your result from Part (a) to predict (with a point predictor) the number of worker- hours that would be required for a production run having a lot size of 65. (c) Accurately sketch your line on the following scatter plot. If you do it right, it should do a good job of "fitting" the observed data points.
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Note that: . (d)
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Recitation VIII Regression Spring 09 - Stat 201 Recitation...

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