6th Edition

ISBN: 9780135927885

Author: Triola

Publisher: PEARSON

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Textbook Question

Chapter 9.3, Problem 1BSC

True? For the methods of this section, which of the following statements are true?

a. When testing a claim with ten matched pairs of heights, hypothesis tests using the P-value method, critical value method, and confidence interval method will all result in the same conclusion.

b. The methods of this section are robust against departures from normality, which means that the distribution of sample differences must be very close to a normal distribution.

c. If we want to use a confidence interval to test the claim that μ_d < 0 with a 0.01 significance level, the confidence interval should have a confidence level of 98%.

d. The methods of this section can be used with annual incomes of 50 randomly selected attorneys in North Carolina and 50 randomly selected attorneys in South Carolina.

e. With ten matched pairs of heights, the methods of this section require that we use n = 20.

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 9.2, Problem 27BB

Chapter 9.3, Problem 2BSC

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