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Get Full Access to Elementary Statistics - 12 Edition - Chapter 5.4 - Problem 9bsc
Get Full Access to Elementary Statistics - 12 Edition - Chapter 5.4 - Problem 9bsc

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# Gender Selection In a test of the YSORT method of gender

ISBN: 9780321836960 18

## Solution for problem 9BSC Chapter 5.4

Elementary Statistics | 12th Edition

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Problem 9BSC

Problem 9BSC

Gender Selection In a test of the YSORT method of gender selection, 291 babies are born to couples trying to have baby boys, and 239 of those babies are boys (based on data from the Genetics&IVF Institute).

a. If the gender-selection method has no effect and boys and girls are equally likely, find the mean and standard deviation for the numbers of boys born in groups of 291.

b. Is the result of 239 boys unusually high? Does it suggest that the YSORT gender-selection method appears to be effective?

Step-by-Step Solution:

Step 1 of 1

In a test of the YSORT method of gender selection, 291 babies are born to couples trying to have baby boys, and 239 of those babies are boys.

Given, n = 291,

Proportion of boy baby p = = 0.5, q = 1 - p = 1 - 0.5 = 0.5

a. If the gender-selection method has no effect and boys and girls are equally likely, find the mean and standard deviation for the numbers of boys born in groups of 291.

Mean μ = np = 2910.5 = 145.5

Standard deviation σ =  = = 8.5293

Step 2 of 2

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