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.The heights are subdivided into five intervals.The degrees of freedom for the goodness-of-fit test for normality is:
Definitions:
Gag Reflex
A reflex contraction of the back of the throat evoked by touching the soft palate, preventing choking.
Lumbar Puncture
A procedure to collect cerebrospinal fluid from the spinal canal for diagnostic purposes or to inject medication, performed in the lumbar region.
Subarachnoid Space
The area between the arachnoid membrane and pia mater around the brain and spinal cord, containing cerebrospinal fluid.
Cerebrospinal Fluid
The clear, colorless body fluid found in the brain and spinal cord, providing cushioning and maintaining a stable environment.
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