When two births are randomly se- lected, the sample space for genders is bb, bg, gb, and gg (where b = boy and g = girl). Assume that those four outcomes are equally likely. Con- struct a table that describes the sam- pling distribution of the sample pro- portion of girls from two births. Does the mean of the sample pro- portions equal the proportion of girls in two births? Does the result suggest that a sample proportion is an unbiased estimator of a popula- tion proportion? 5. BIRTHS: SAMPLING DISTRIBU- TION OF SAMPLE PROPORTION Repeat Exercise 15 using three births instead of two births.

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