Question

A constant objective in the manufacture of contact lenses is improving the level and variation for those features that affect lens power and visual acuity. One such feature involves the tooling from which lenses are ultimately manufacture d. The results of two initial process development runs were examined for Critical Feature A. Two distinct product lots were manufactured with slight differences designed to affect the feature in question. Each lot was then sampled. Lot 1 had a smaller run time than Lot 2, and therefore more samples were taken from Lot 2.
a. Calculate the mean and standard deviation of Critical Feature A for Lots 1 and 2.
b. Is there evidence of a difference in the variability of Critical Feature A between Lots 1 and 2? Use an alpha value of 5% to make a determination.
c. Is there evidence of a difference in the mean levels of Critical Feature A between Lots 1 and 2? Use an alpha value of 5% to make a determination.


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  • CreatedAugust 28, 2015
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