Ted researched the price of airline tickets and discovered a correlation between the price of a ticket and the number of miles traveled. After recording his data on a scatter plot, he determined the equation for the line of best fit is y = 300 + 0.45x. How can you tell from the equation that the correlation between the cost of a plane ticket and the number of miles traveled is positive? What does a positive correlation tell you about the dependent and independent variables?
Responses
A A positive correlation cannot be determined from examining an equation.A positive correlation cannot be determined from examining an equation.
B 300 is a positive y-intercept. The dependent and independent variables must be positive.300 is a positive y-intercept. The dependent and independent variables must be positive.
C 300 is a positive x-intercept. The dependent and independent variables must be positive.300 is a positive x-intercept. The dependent and independent variables must be positive.
D 0.45 is a positive slope. The dependent variable y increases as the independent variable x increases.