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Chapter 11: Q. 3.2 (page 705)

Use FacebookMain CampusCommon wealthSeveral times a month or less5576At least once a week215157At least once a day640394Total Facebook users910627

Interpret the p-value from the calculator in context.

Short Answer

Expert verified

The p-value using the calculator is 0.000059.

Step by step solution

01

Given Information

Use FacebookMain CampusCommon wealthSeveral times a month or less5576At least once a week215157At least once a day640394Total Facebook users910627

02

Explanation

The p-value using the calculator is 0.000059.

It is assumed that no difference exists in the usage of Facebook between the students at common wealth campuses and main campus, the probability of having a difference in the distribution is large or larger than the one obtained in the study is around 6in 100,000.

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Most popular questions from this chapter

The cell in the table that contributes the most to the chi-square statistic is (a) Female, 50–50 chance.

(b) Male, 50–50 chance.

(c) Female, almost certain.

(d) Male, almost certain.

(e) All the cells contribute equally to the test statistic.

North Carolina State University studied student performance in a course required by its chemical engineering major. One question of interest was the relationship between time spent in extracurricular activities and whether a student earned a C or better in the course. Here are the data for the 119 students who answered a question about extracurricular activities:

(a) Calculate percentages and draw a bar graph that describes the nature of the relationship between time spent on extracurricular activities and performance in the course. Give a brief summary in words.

b) Explain why you should not perform a chi-square test in this setting.

Sorry, no chi-square (11.1) Explain why it would not be appropriate to perform a chi-square goodness-of-fit test in this setting.

T11.5. We compute the value of theχ2statistic to be 6.58. Assuming that the conditions for inference are met, the P-value of our test is

(a) greater than 0.20

(b) between 0.10and 0.20.

(c) between 0.05and 0.10.

(d) between0.01 and 0.05

(e) less than 0.01

Canada has universal health care. The United States does not but often offers more elaborate treatment to patients with access. How do the two systems compare in treating heart attacks? Researchers compared random samples of 2600U.S. and 400Canadian heart attack patients. One key outcome was the patients’ own assessment of their quality of life relative to what it had been before the heart attack. Here are the data for the patients who survived a year:

Quality of lifeCanadaUnited StatesMuch better75541Somewhat better71498About the same96779Somewhat worse50282Much worse1965Total3112165

Construct an appropriate graph to compare the distributions of opinions about the quality of life among heart attack patients in Canada and the United States.
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