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Report Abuse. For length the average is 5.88 inches and the median is 5.65 inches. For girth the average is 4.97 inches and the median is 4.67 inches. The average is larger because very long and very thick ones bias things a bit. Source(s): http://www.mraverage.com/stats.htm. Jordan Â· 7 years ago.
There is no universal constant at which the sample size is generally considered large enough to justify use of the plug-in test. Typical rules of thumb range from 20 to 50 samples. For larger sample sizes, the t-test procedure gives almost identical p-values as the Z-test procedure.