- You think that level of education is related to criminal behavior. You take a sample of 9 people with differing levels of education and have them self-report on criminal behavior in the past year.
No High School HS/GED Some College 631 320 442
a. What is the independent variable and what is the dependent variable?
IV: DV:
- You have data on two variables:
1) Self-restraint measured at age 10: Those who score high on this measure have a lot of self-restraint and think about things before doing them. It is a continuous variable. It is measured in the following way: a plate of cookies was placed before each kid by an experimenter who told the kid not to take a cookie until “he/she really wanted it’. The experimenter then left the room and the score for each kid is the number of minutes that passed before a kid grabbed a cookie — those who took less time have less self-restraint.
2) Number of delinquent acts committed between the ages of 10 and 17.
Here are your data: Self-Restraint Number of Delinquent Acts 22 1 20 3 38 54 25 88 73 54 4 10 133 96 28 11 7 19 47 56 27 123 10 1 132 28 37 19
25 3
20 0
a. Graph the two variables with the correct independent variable on the x axis and dependent variable on y axis. Does it look like there’s a relationship? Does it look at least approximately linear?
b. Calculate and interpret the correlation coefficient. c. Calculate and interpret the value of R2 . d. Estimate and interpret the regression coefficients. e. What is the predicted number of delinquent acts for a kid who has a self-restraint score of 5, 10, 15 and
20?
Sample Solution
