12th Edition

ISBN: 9780321837936

Author: Mario F. Triola

Publisher: PEARSON

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A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

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Textbook Question

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 4.5, Problem 24BSC

Chapter 4.5, Problem 26BSC

Chapter 4 Solutions

Elementary Statistics

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Solution Summary: The author explains that the probability of identical twins is 0.333, based on the data from the ‘Northern California Twin Registry’.

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Chapter 4 Solutions