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STT 422 Sample Exam 2

# STT 422 Sample Exam 2 - STT 422 Sample Exam 2 Summer 2008...

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STT 422 Sample Exam 2 Summer 2008 Part 1: Contingency Tables and Chi-Square Tests: 1. Given the following contingency table: High GPA Middle GPA Low GPA Lower Classman 20 30 10 Upper Classman 15 40 15 a) What is the test statistic for a test for association? b) What are the degrees of freedom and p-value associated with this test? c) Is there an association between GPA and class at the 0.05 level? 2. Suppose we want to test if, among people with more than \$10,000 debt, the true distribution of ages is 40% age 20-40, 35% age 41- 59, 25% age 65 and up. We take a sample and get: Age 20-40 41-59 65 and up Count 45 30 10 a) What is the test statistic associated with this test? b) What are the degrees of freedom and p-value associated with this test? c) Does the model fit at the 0.05 level? Part 2: Logistic Regression: 1. A model was fit to find risk factor for stunted growth in young children. The following model has the variables stunted (0 = normal, 1 = stunted) as the outcome and nutrition (0 = poor nutrition, 1= average nutrition, 2= good nutrition) and weight (continuous) as predictors.

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STT 422 Sample Exam 2 - STT 422 Sample Exam 2 Summer 2008...

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