Each gum drop in two bags of Sathers Gum Drops was weighed (to the nearest .001 g) on a sensitive Mettler PE 360 Delta Range scale. After removing one outlier (to improve normality), there were 84 gum drops in the sample, yielding an overall mean x-bar = 11.988 g and a pooled standard deviation s 5 .2208 g.
(a) Use these sample statistics to construct control - limits for an x chart, using a subgroup size n 5 6.
(b) Plot the means shown below on your control chart. Is the process in control?
(c) Prepare a histogram and/or normal probability plot for the pooled sample. Does the sample support the view that gum drop weight is a normally distributed random variable? Explain.

  • CreatedAugust 19, 2015
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