7th Edition

ISBN: 9781337372763

Author: BRASE

Publisher: Cengage Learning

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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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Textbook Question

Chapter 8.3, Problem 8P

Basic Computation: Confidence Interval for p Consider n = 200 binomial trials with r= 80 successes.

(a) Check Requirements Is it appropriate to use a normal distribution to approximate the p ^ distribution ?

(b) Find a 95% confidence interval for the population proportion of successes p.

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 8 Solutions

UNDERSTANDING BASIC STAT LL BUND >A< F

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Solution Summary: The author explains that the normal distribution can be used to estimate the stackrelp distribution. The 95% confidence interval for the population proportion of successes p is from 0.332 to 0.4

Concept explainers

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Chapter 8 Solutions