Introduction To Statistics And Data Analysis
6th Edition
ISBN: 9781337793612
Author: PECK, Roxy.
Publisher: Cengage Learning,
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Chapter 12.1, Problem 5E
A popular urban legend is that more babies than usual are born during certain phases of the lunar cycle, especially near the full moon. The paper “The Effect of the Gravitation of the Moon on Frequency of Births” (Environmental Health Insights [2010]: 65–69) classified a random sample of 1007 births at a large hospital in Japan according to lunar phase. In each lunar cycle (27.32 days), the moon moves 360° relative to the earth. To determine lunar phase, the researchers divided the 360° in one lunar cycle into 12 phases of 30°. The sample data are summarized in the accompanying frequency table.
The researchers concluded that the frequency of births is not related to lunar cycle. Carry out a chi-square goodness-of-fit test to determine if the data are consistent with the researchers’ claim. Use a significance level of 0.05 for your test.
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Chapter 12 Solutions
Introduction To Statistics And Data Analysis
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