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ChiSquare Hypothesis Tests for Association or Independence
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Statistics Assignment Page 1 of 2 ChiSquare Hypothesis Tests for Association or Independence
_____________ © Copyright 2000 Apex Learning Inc. All rights reserved. This material is intended for the exclusive use of registered users only. No portion of these materials may be reproduced or redistributed in any form without the express written permission of Apex Learning Inc.
1. Calculate the expected values for the cells marked A, B, and C in the following table: (2 points)
A 104 B 170
C 112 120 144 122 386
2. You decide to research a certain topic. You collect data and organize them into a 5 X 7 table. You find that a chisquare test would be valid for your data, and find that this table has a X 2 of 34.5.
A. What conclusion would you draw about the relationship between these two variables if α = .05? (2 points)
B. What conclusion would you draw about the relationship between these two variables if α = .10? (2 points)
3. Calculate degrees of freedom, X 2 , and an exact Pvalue for the following table: (2 points)
79 93 103 44 68 99
4. You want to know if there's an association between college students' spring break destinations and what year they're in. You take a random sample of 405 college students and record the following data:
Amusement Parks Mexico Home Other
Freshman 23 21 43 21 Sophomore 34 23 14 26 Junior 25 30 23 26 Senior 27 33 17 19
A. Set up your null and alternative hypotheses. (2 points)
B. What are your degrees of freedom? (2 points)
C. Using your TI83, compute the expected values for each cell. (2 points)
D. Will a chisquare hypothesis test of independence be valid in this situation? Explain. (2 points)
E. What are your test statistic (X 2 ) and Pvalue? (2 points)
F. What can you conclude if α = .01? (2 points)
Statistics Assignment Page 2 of 2 ChiSquare Hypothesis Tests for Association or Independence
_____________ © Copyright 2000 Apex Learning Inc. All rights reserved. This material is intended for the exclusive use of registered users only. No portion of these materials may be reproduced or redistributed in any form without the express written permission of Apex Learning Inc.
5. A hotel wants to know if there's a relationship between gender and the way customers make room reservations. A manager takes a random sample of 160 reservations. She records whether they were made by a man or a woman, and also records how the reservation was made. She gets the following data:
Phone Fax Email Men 28 9 37
Women 45 12 29
Perform a chisquare significance test of association with α = .05. Be sure to include your null and alternative hypotheses, a justification for the use of this test, your test statistic calculations, your Pvalue, and your conclusion. (5 points)