A researcher conducts an OLS regression to evaluate the impact of poverty (measured as the percent of people living below the poverty line) on the firearm homicide rate. Based on her model, she predicts that cities with no poverty have a rate of 3.2 homicides per 100,000 population, and every one percent increase in poverty increases the homicide rate by 0.09. What is the homicide rate when the 45% live in poverty? 

A researcher wants to know if there is a significant relationship between job experience and job stress. From a sample of 10 correctional officers, she collects data on the number of years of work experience and job stress measured on a scaled ranging from 0 to 10.  What is the critical value of t for testing this correlation, assuming an alpha of 0.05?

Which of the following is a nonparametric test of association?

A totally fictitious researcher wants to test whether there is a significant relationship between number of shih tzus owned and happiness. After analyzing the data on a sample of 50, she determines that r = 0.34. What is her calculated t score?

A researcher wants to know if there is a significant relationship between job experience and job stress. From a sample of 10 correctional officers, she collects data on the number of years of work experience and job stress measured on a scaled ranging from 0 to 10. 

Below is a diagram representing an OLS regression with two predictors, X1 and X2.  Which of the following represents the proportion of variance in Y NOT explained by X1 and X2?

Which variable do we have the highest level of confidence in?

Is there a sex difference in running red lights? A researcher recorded traffic violations and driver sex in the table below. What are the degrees of freedom? 

Which condition must be satisfied for chi-square to be valid?

Below is a diagram representing an OLS regression with two predictors, X1 and X2.  What does A + D represent?