S1. Explore the relationship between the number of siblings a respondent has (SIBS) and his or her number of children (CHILDS).

1. Construct a scatterplot of these two variables in SPSS, and place the best-fit linear regression line on the scatterplot. Describe the relationship between the number of siblings a respondent has (independent variable) and the number of his or her children (dependent variable).

2. Calculate the regression equation predicting CHILDS with SIBS. What are the intercept and the slope? What are the coefficient of determination and the correlation coefficient?

3. What is the predicted number of children for someone with three siblings?

4. What is the predicted number of children for someone without any siblings?