If all the points of a scatter diagram lie on the least squares regression line, then the coefficient of determination for these variables based on these data
a. is 0.
b. is 1.
c. is either 1 or -1, depending upon whether the relationship is positive or negative.
d. could be any value between -1 and 1.
Question 2
The salaries at a corporation are normally distributed with an average salary of 19,000 and a standard deviation of 4,000.
a. What is the probability that an employee will have a salary between 12,520 and 13,480?
b. What is the probability that an employee will have a salary more than 11,880?
c. What is the probability that an employee will have a salary less than 28,440?
