Statistics problems Check Your Understanding Consider the following returns data for the market and XYZ, Inc. What was the average market return over this period? _ What was XYZ's average return? _ Because the data only covers four years of market and stock returns, the _ standard deviation is the appropriate measure of dispersion to use. XYZ's standard deviation of returns was _ The correlation coefficient between the returns on XYZ and the market is_ The beta of a regression line between XYZ and the market is