Topic_8.1___Statistical_Inference___Comparison_of_Two_Groups___Examples

Topic_8.1___Statistical_Inference___Comparison_of_Two_Groups___Examples

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Comparison of Two Groups – Examples Ash Genaidy
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Large-Sample Test for the Mean -- Case Study Plastic containers for motor oil are blow molded in a machine that has two feeders, each feeding into two three molding stations( a total of six stations). Plastic is extruded through the feeders into continuous cylinders between two halves of each mold. As the molds close, the cylinders are pinched off and air is blown into them to form the container shapes.
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Case Study The production engineer is concerned that the weights of molded containers at the two feeders are not uniform. To investigate the cause behind this and to identify the problematic stations, a random sample of twenty-four samples is taken from stations connected with each feeder. Test whether there are differences between the groups
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Schemat i c Pl ot s | 52. 4 + | | | | | | | 52. 2 + | | | | | | | | | | | 52 + | | | | +- - - - - + | | | | | | | | 51. 8 + | | | | | | + | | | * - - - - - * | +- - - - - + | | 51. 6 + | | | | | | | +- - - - - + | | | | | | | | 51. 4 + | + | | | * - - - - - * | | | | | | | | | 51. 2 + | | | | | | +- - - - - + | | 51 + | | | | | | | 50. 8 + | | | | | 50. 6 + - - - - - - - - - - - - +- - - - - - - - - - - +- - - - - - - - - - - f eeder 1 2 SAS Output – Box Plot for Two Groups
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Confidence Interval Feeder # of Obs. Lower 95% CI for Mean
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This note was uploaded on 10/13/2010 for the course MINE 340 taught by Professor Geinady during the Summer '04 term at University of Cincinnati.

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Topic_8.1___Statistical_Inference___Comparison_of_Two_Groups___Examples

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