[EX09-150] Molds are used in the manufacture of contact lenses so that the lens material on proper

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[EX09-150] Molds are used in the manufacture of contact lenses so that the lens material on proper preparation and curing will be consistent and meet designated dimensional criteria.

Molds were fabricated and a critical dimension measured for 15 randomly selected molds. (Data have been doubly coded to insure propriety.)

140 130 15 180 95 135 220 105 195 110 150 150 130 120 120 Courtesy of Bausch & Lomb

a. Construct a histogram and find the mean and standard deviation.

b. Demonstrate how this set of data satisfies the assumptions for inference.

c. Find the 95% confidence interval for .

d. Interpret the meaning of the confidence interval.

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