Exhibit 12.7 The heights (in cm) for a random sample of 60 males were measured.The sample mean is 166.55,the standard deviation is 12.57,the sample kurtosis is 0.12,and the sample skewness is -0.23.The following table shows the heights subdivided into non-overlapping intervals. 
Refer to Exhibit 12.7.For the chi-square test for normality,the null and alternative hypothesis are:
Definitions:
Production Function
A mathematical relationship describing the maximum output possible from a given set of inputs in the production process.
Plastic
A synthetic material made from a wide range of organic polymers that can be molded into shape while soft, and then set into a rigid or slightly elastic form.
Wood
The hard, fibrous structural tissue found in the stems and roots of trees and other woody plants.
Cost Function
A mathematical relationship that describes how the costs incurred by a firm vary with the level of output or activity.
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