The Journal of Genetic Counseling compiled statistics on thousands of births ove

Question

The Journal of Genetic Counseling compiled statistics on thousands of births over a long period of time, and reported that otherwise healthy first cousins are at no great risk of passing chance birth defects onto their children: "normal" parents have a 3 to 4 percent chance of bearing a child with a serious birth defect, compared to a 5 to 7 percent chance for first cousins.

(a) Sample percentages were presumably at the center of each reported range. Report the sample percentage of birth defects for "normal" parents and for first cousins. (Round your answer to one decimal place.)

Explanation / Answer

So, if normal parents have an interval of passing it on of (.03,.04), then the center of that interval is 3.5%, or .035. So, the sample percentage is 3.5%/ For first cousins, the center of the interval of (.05,.07) is .06. So, first cousons have a 6% chance of passing it on.

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