Introduction To Statistics And Data Analysis
6th Edition
ISBN: 9781337793612
Author: PECK, Roxy.
Publisher: Cengage Learning,
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Textbook Question
Chapter 12.3, Problem 29E
The following passage is from the paper “Gender Differences in Food Selections of Students at a Historically Black College and University” (College Student Journal [2009]: 800-806):
Also significant was the proportion of males and their water consumption (8 oz. servings) compared to females (X2 = 8.16, P = 0.086). Males came closest to meeting recommended daily water intake (64 oz. or more) than females (29.8% vs. 20.9%).
This statement was based on carrying out a X2 test of independence using data in a two-way table where rows corresponded to sex (male, female) and columns corresponded to number of servings of water consumed per day, with categories none, one, two to three, four to five, and six or more.
- a. What hypotheses did the researchers test? What is the number of degrees of freedom associated with the report value of the X2 statistic?
- b. The researchers based their statement that the proportions falling in the water consumption categories were not all the same for males and females on a test with a significance level of 0.10. Would they have reached the same conclusion if a significance level of 0.05 had been used? Explain.
- c. The paper also included the accompanying data on how often students said they had consumed fried potatoes (fries or potato chips) in the past week.
Use the Minitab output that follows to carry out a X2 test of independence. Is the authors’ conclusion that there was a significant association between sex and consumption of fried potatoes justified?
Expected counts are printed below observed counts
Chi-Square contributions are printed below expected counts
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Chapter 12 Solutions
Introduction To Statistics And Data Analysis
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Ch. 12.1 - How would you answer the following question: Next...Ch. 12.1 - USA Today (Hybrid Car Sales Rose 81% Last Year,...Ch. 12.1 - A certain genetic characteristic of a particular...Ch. 12.2 - A particular state university system has six...Ch. 12.2 - A random sample of 1000 registered voters in a...Ch. 12.2 - Prob. 16ECh. 12.2 - Some colleges now allow students to pay their...Ch. 12.2 - The Knight Foundation asked each person in a...Ch. 12.2 - The Knight Foundation investigated whether high...Ch. 12.2 - Each person in a representative sample of 445...Ch. 12.2 - The report Education Pays 2016 (The College...Ch. 12.2 - The report Consumer Revolving Credit and Debt Over...Ch. 12.2 - Prob. 23ECh. 12.2 - The authors of the paper Movie Character Smoking...Ch. 12.2 - The data summarized in the accompanying table are...Ch. 12.2 - The paper Credit Card Misuse, Money Attitudes, and...Ch. 12.2 - Each person in a large sample of German...Ch. 12.2 - Can people tell the difference between a female...Ch. 12.3 - The following passage is from the paper Gender...Ch. 12.3 - The article titled Nap Time...Ch. 12.3 - Using data from a national survey, the authors of...Ch. 12 - Each observation in a random sample of 100 bicycle...Ch. 12 - The color vision of birds plays a role in their...Ch. 12 - Prob. 34CRCh. 12 - Prob. 35CRCh. 12 - Prob. 36CR
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