Explanation Given info: The data shows that the number of homicides that occurred each month in New York City. Calculation: The claim is to test whether there is sufficient evidence to support the police commissioner’s claim that homicides occur more often in the summer when the weather is better. If the claim is false, then there is no sufficient evidence to support the police commissioner’s claim that homicides occur more often in the summer when the weather is better. The hypotheses are given below: Null hypothesis: H 0 : There is no sufficient evidence to support the police commissioner’s claim that homicides occur more often in the summer when the weather is better. Alternative hypothesis: H 1 : There is sufficient evidence to support the police commissioner’s claim that homicides occur more often in the summer when the weather is better. Chi-square test statistic : The test statistic is calculated by using the below formula, χ 2 = ∑ ( O −

5th Edition

ISBN: 9780321924599

Author: Mario F. Triola

Publisher: PEARSON

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.

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Chapter 11.2, Problem 9BSC

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To test: Whether there is sufficient evidence to support the police commissioner’s claim that homicides occur more often in the summer when the weather is better or not.

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Chapter 11.2, Problem 8BSC

Chapter 11.2, Problem 10BSC

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To test: Whether there is sufficient evidence to support the police commissioner’s claim that homicides occur more often in the summer when the weather is better or not.

Solution Summary: The author concludes that there is no sufficient evidence to support the police commissioner's claim that homicides occur more often in the summer when the weather is better.

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To test: Whether there is sufficient evidence to support the police commissioner’s claim that homicides occur more often in the summer when the weather is better or not.

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Chapter 11 Solutions