3rd Edition

ISBN: 9780135231548

Author: Gould

Publisher: PEARSON C

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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 13, Problem 47CRE

Ice Cream Cones McDonald’s claims that its ice cream cones typically weigh 3.18 ounces (converted from grams). Here are the weights, in ounces, of cones purchased on different days from different servers:

4.2, 3.6, 3.9, 3.4, and 3.3

Carry out a sign test to determine whether the median is greater than 3.18 ounces. Use a significance level of 0.05. Why is the sign test a more appropriate choice than the one-sample

t -test? See page 681 for guidance.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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Chapter 13, Problem 46CRE

Chapter 13, Problem 48CRE

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Solution Summary: The author explains that the median weight of the ice cream cone is significantly greater than the one-sample. The sign test is used because there is no information whether the distribution is normal or not.

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