It is conventional wisdom in military squadrons that pilots tend to father more girls than boys. Snyder (1961) gathered data for military fighter pilots. The sex of the pilots offspring were tabulated for three kinds of flight duty during the month of conception, as shown in the following table. Is there any significant difference between the three groups? In the United States in 1950, 105.37 males were born for every 100 females. Are the data consistent with this sex ratio?

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