Which of the following best defines linear regression? O a. It uses a linear association to calculate confidence intervals for means. O b. It uses a linear association to predict variables. O c. It is a method that predicts the values of one numerical variable from values of another, assuming a linear relationship between them. O d. It is a method that looks for a linear pattern between the values of one numerical variable and another.The rate of change in Yper unit X is called which of the following? O a. The velocity. O b. The run. O c. The slope. O d. The angle.The slope of the least squares regression line is equal to which of the following? O a. The sum of the products divided by the sum of squares for Y. O b. The sum of squares for X divided by the sum of the products. O c. The sum of the products divided by the sum of squares for X. O d. The sum of squares for Y divided by the sum of the products.What is the equation for the linear least squares line for a data set with a mean X value of 10, a mean Yvalue of 12, and a slope of 0.7? O a. Y= 5+ (1.2)X Ob. Y= 7+ (1.2)x O c. Y= 7 + (0.5)x O d. Y= 5+ (0.7)X