A researcher wishes to examine the relationship between years of schooling completed and the number of pregnancies in young women. Her research discovers a linear relationship, and the model is: y=34xy^=3-4x where x is the number of years of schooling completed and y is the number of pregnancies.The slope of this line can be interpreted in the following way:

• When amount of schooling increases by one year, the number of pregnancies tends to increase by 3.
• When amount of schooling increases by one year, the number of pregnancies tends to decrease by 4.
• When amount of schooling increases by one year, the number of pregnancies tends to decrease by 3.
• When amount of schooling increases by one year, the number of pregnancies tends to increase by 4.