Question: In the manufacture of soft contact lenses the power the

In the manufacture of soft contact lenses, the power (the strength) of the lens needs to be very close to the target value. In the paper “An ANOM-Type Test for Variances from Normal Populations’’ [Technometrics (1997) 39: 274–283], a comparison of several suppliers is made ­relative to the consistency of the power of the lens. The following table contains the deviations from the target power value of lenses produced using materials from three different suppliers:
a. Compute the mean and standard deviation for the deviations of each supplier.
b. Plot the sample deviation data.
c. Describe the deviation from specified power for the three suppliers.
d. Which supplier appears to provide material that produces lenses having power closest to the target value?

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