biostats11 - Heather Oslund BIO318M 50200 Sp10: Janne T3-4...

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Heather Oslund BIO318M 50200 Sp10: Janne T3-4 Assignment 11 SPSS i. What is the relationship between aflatoxin and corn yield? What is aflatoxin? ii. Are the cases randomly sampled from a large population? Are the cases independent? How was the data collected? iii. I would first decide what the question of interest is and what kind of variables we are dealing with (aflatoxin-categorical nominal, corn yield- quantitative continuous). We have 2 groups (the two aflatoxin levels). Then I would do descriptive statistics. Paneled histogram of corn yield for different levels of Aflatoxin
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Heather Oslund BIO318M 50200 Sp10: Janne T3-4 Box plots of corn yield for different Aflatoxin levels
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Heather Oslund BIO318M 50200 Sp10: Janne T3-4 iv. With quantitative response and 2 categorical dichotomous variables you could do a t-test of Wilcoxon-Mann-Whitney test. v. Since the data does not appear very normal the most reliable test would be the Wilcoxon- Mann-Whitney test with α =0.05 but I will also run a t-test to get the 95% confidence
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biostats11 - Heather Oslund BIO318M 50200 Sp10: Janne T3-4...

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