Lab Competency 4

II. Competency Assessment C6. Describe basic concepts of random variation and commonly used statistical probability distributions. To successfully complete this competency, complete the analysis write-up for Laboratory 4's computer exercise (listed on Page 1 above) and answer the following question: If we assume that male and female births are equally likely: a. In a family of three children, what is the probability of 2 boys and 1 girl? P (2 boys, 1 girl) = P(BBG) + P(BGB) + P(GBB) = ½ ½ ½ ½ ½ ½ ½ ½ ½ = ? (37.5%) b. In a family of four children, what is the probability of 2 boys and 2 girls? P (2 boys, 2 girls) = P(BBGG) + P(BGGB) + P(GGBB) + P(GBBG) + P(GBGB) + P(BGBG) = ½ ½ ½ ½ ½ ½ ½ ½ ½ ½ ½ ½ ½ ½ ½ + ½ ½ ½ = 6/8 (75%)