The student will explore the properties of contingency tables.
smoking level/day | ethnicity | |||||
African American | Native Hawaiian | Latino | Japanese Americans | White | TOTALS | |
1-10 | ||||||
11-20 | ||||||
21-30 | ||||||
31+ | ||||||
TOTALS |
Summary: Note: This module is currently under revision, and its content is subject to change. This module is being prepared as part of a statistics textbook that will be available for the Fall 2008 semester.
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The student will explore the properties of contingency tables.
smoking level/day | ethnicity | |||||
African American | Native Hawaiian | Latino | Japanese Americans | White | TOTALS | |
1-10 | ||||||
11-20 | ||||||
21-30 | ||||||
31+ | ||||||
TOTALS |
Conduct a hypothesis test to determine if smoking level and ethnicity are independent.
Copy the data from Chapter 3, Practice 2, into the above table.
State the hypotheses.
Enter expected values on the above table. (Round to two decimal places.)
Fill in the information below.
degrees of freedom = __________
12
10301.8
0
Is this a right-tailed, left-tailed, or two-tailed test? __________ Explain why.
right
Graph the situation. Label and scale the horizontal axis. Mark the mean and test statistic. Shade in the region corresponding to the
State the decision and conclusion (in a complete sentence) for the following preconceived levels of
Decision: _____________________________________________________
Reason for the Decision: _________________________________________
Conclusion (write out in a complete sentence): _______________________ __________________________________________________________ __________________________________________________________
Reject the null hypothesis
Decision: _____________________________________________________
Reason for the Decision: _________________________________________
Conclusion (write out in a complete sentence): _______________________ __________________________________________________________ __________________________________________________________
Reject the null hypothesis