Essentials of Statistics Books a la carte Plus NEW MyLab Statistics with Pearson eText - Access Card Package (5th Edition)
5th Edition
ISBN: 9780133892697
Author: Mario F. Triola
Publisher: PEARSON
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Chapter 4.5, Problem 25BSC
Identical and Fraternal Twins. In Exercises 25-28, use the data in the following table. Instead of summarizing observed results, the entries reflect the actual probabilities based on births of twins (based on data from the Northern California Twin Registry and the article “Bayesians, Frequeatists, and Scientists” by Bradley Efron, Journal of the American Statistical Association, Vol. 100, No. 469). Identical twins come from a single egg that splits into two embryos, and fraternal twins are from separate fertilized eggs. The table entries reflect the principle that among sets of twins, 1/3 are identical and 2/3 are fraternal Also, identical twins must be of tire same sex and the sexes are equally likely (approximately), and sexes of fraternal twins are equally likely.
Sexes of Twins
| boy/boy | boy/girl | girl/boy | girl/girl | |
| Identical Twins | 5 | 0 | 0 | 5 |
| Fraternal Twins | 5 | 5 | 5 | 5 |
26. Idontical Twins
- a. After having a sonogram, a pregnant woman learns that she will have twins. What is the
probability that she will have identical twins? - b. After studying the sonogram more closely, the physician tells the pregnant woman that she will give birth to twin boys. What is the probability that she will have identical twins? That is find the probability of identical twins given that the wins consist of two boys.
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Chapter 4 Solutions
Essentials of Statistics Books a la carte Plus NEW MyLab Statistics with Pearson eText - Access Card Package (5th Edition)
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