TheCaseoftheCarelessZookeeper.pdf

# Nominal ordinal interval ratio 3 how many total

• 13

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Nominal / Ordinal / Interval / Ratio 3. How many total animals were there in your train car (cell “a”)? __________ 4. How many of the animals in the train car were carnivores (cell “b”)? __________ 5. How many of the animals in the train car were herbivores (cell “c”)? __________ 6. How many of the animals exhibited signs of damage (cell “d”)? __________ 7. How many of the animals did not e xhibit signs of damage (cell “e”)? __________ 8. How many of the carnivores had signs of damage (cell “f”)? __________ 9. How many of the carnivores did not have signs of damage (cell “g”)? __________ 10. How many of the herbivores had signs of damage (cell “h”)? __________ 11. How many of the herbivores did not have signs of damage (cell “i”)? __________ 12. What proportion of carnivores was damaged while in transit? __________ 13. What proportion of carnivores was not damaged while in transit? __________ 14. What proportion of herbivores was damaged while in transit? __________ 15. What proportion of herbivores was not damaged while in transit? __________ 16. Do you think the answers to Questions 12 and 14 provide strong evidence that there is a relationship between the type of animal and injury status? Yes or No? Please Explain

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_____________________________________________________________________________________________ ST atistics E ducation W eb: Online Journal of K-12 Statistics Lesson Plans 11 Contact Author for permission to use materials from this STEW lesson in a publication 17. Regardless of your answer to 16, set up the necessary hypotheses for a chi-square test for Independence (alpha = .05). 18. Check the assumptions for the test. That is, find the expected cell counts for cells (f), (g), (h), and (i). Are all the expected cell counts greater than 1? Are at least 80% of the cell counts greater than 5? Even if the assumptions aren’t met, contin ue to carry out the test, but note how the assumptions are not met. 19. Use the expected and observed cell counts to calculate the test statistic.
_____________________________________________________________________________________________ ST atistics E ducation W eb: Online Journal of K-12 Statistics Lesson Plans 12 Contact Author for permission to use materials from this STEW lesson in a publication 20. Find the p-value using the correct number of degrees of freedom. 21. What conclusion can you make from the p-value found in 20? How would you interpret this in the context of the problem? 22. Suppose all of the class data was compiled into one table and a chi-square test was run. Should this test be carried out? Can you even interpret the results from the test? Why or Why not?

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_____________________________________________________________________________________________ ST atistics E ducation W eb: Online Journal of K-12 Statistics Lesson Plans 13 Contact Author for permission to use materials from this STEW lesson in a publication CLASSIFICATION OF ANIMALS
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• Fall '17
• Statistics, Statistical hypothesis testing, STatistics Education Web, K-12 Statistics Lesson, Statistics Lesson Plans, Online Journal of K-12

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