## Examination 3

Directions:
Respond to each item in a clear and concise paragraph. (In some cases, a single sentence will suffice.) Do not copy passages from the lectures or book. Rather, express your own understanding of the material. Do not write anything or everything that comes to mind; instead, try to devise a brief answer that captures the most relevant information. Before you submit, make a note of the number in the first comment, below. You will need to input this number into the form to submit your work. (This is to prevent spammers from using the form. Sorry about that. Spammers ruin everything.)

Part I. Hypothesis Testing

1. In your own words, contrast a type-I error with a type-II error. Why do we generally set alpha at 0.05?

2. The per capita income for whites in New York in 1990 was \$18,584, and for blacks was \$10,566. Suppose that we collect data from 300 Census Tracts in Kings County and find that the income per capita for whites is \$21,678 and for blacks is \$12,349. State the null and research hypotheses for a test of the difference between race groups.

3. Suppose you want to know if political party affiliation affects attitude toward the Tea Party movement. Identify variables in CBS2011 you could use to test this relationship. State the hypotheses.

Part II. Correlation and Linear Regression

4. Select two numeric variables in one of our dataframes. Calculate the correlation. Interpret the results. Using the same two variables, calculate the simple linear regression model. Interpret the results. What is the advantage, in this case, of using regression instead of correlation?

Part III. Multiple Linear Regression

5. Select a numeric dependent variable and at least five independent variables (binary or numeric) from one of our dataframes and perform the hypothesis test. Interpret the results.

Part IV. Logistic Regression

6. Select a binary dependent variable and at least five independent variables (binary or numeric) from one of our dataframes and perform the hypothesis test. Interpret the results.

Part V. Research Articles

7. Summarize Table 4 in Granberg, et al.

8. Summarize Table 3 in Hogan & Seifert.

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