RESEARCH METHODS-W/ACCESS >CUSTOM<
5th Edition
ISBN: 9781305743625
Author: GRAVETTER
Publisher: CENGAGE C
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Textbook Question
Chapter 12, Problem 6E
The following list contains several variables that differentiate college students.
a. Select two variables from the list that should have a consistent relationship (either positive or negative). Briefly describe how you would do a
b. Describe how you would do a nonexperimental,
differential research study to evaluate the same relationship (see Box 10.1, p. 245).
physical attractiveness
intelligence
alcohol consumption
shyness
exam anxiety
hours of sleep per night
hours of television per week
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Reconsider the patient satisfaction data in Table 1. Fit a multiple regression model using both patient age and
severity as the regressors.
(a) Test for significance of regression.
(b) Test for the individual contribution of the two regressors. Are both regressor variables needed in the model?
(c) Has adding severity to the model improved the quality of the model fit? Explain your answer.
The output voltage of a power supply is assumed to be normally distributed. Sixteen observations taken at
random on voltage are as follows: 10.35, 9.30, 10.00, 9.96, 11.65, 12.00, 11.25, 9.58, 11.54, 9.95, 10.28, 8.37,
10.44, 9.25, 9.38, and 10.85.
(a) Test the hypothesis that the mean voltage equals 12 V against a two-sided alternative using a = 0.05.
(b) Construct a 95% two-sided confidence interval on μ.
(c) Test the hypothesis that σ² = 11 using α = 0.05.
(d) Construct a 95% two-sided confidence interval on σ.
(e) Construct a 95% upper confidence interval on σ.
(f) Does the assumption of normality seem reasonable for the output voltage?
Analyze the residuals from the regression model on the patient satisfaction data from Exercise 3. Comment on
the adequacy of the regression model.
Chapter 12 Solutions
RESEARCH METHODS-W/ACCESS >CUSTOM<
Ch. 12.1 - Define the goal or purpose of the correlational...Ch. 12.2 - Prob. 2LOCh. 12.2 - Identify the statistical procedure used to...Ch. 12.3 - Describe how correlations are used for prediction,...Ch. 12.4 - Prob. 5LOCh. 12 - In addition to the key words, you should also be...Ch. 12 - Explain how the purpose of a correctional study...Ch. 12 - Each of the following studies examines the...Ch. 12 - Describe the pattern that would appear in a...Ch. 12 - Suppose that there is a negative relationship...
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