The range of values that correlation coefficients can take can be: zero to +1 - infinity to +infinity zero to + infinity -1 to +1 A statistical measure of the degree to which securities' returns move together is called: Variance Market Risk Standard Deviation o Correlation Coefficient Which of the following portfolios have the least risk? Portfolio of U.S. common stocks of small firms A portfolio of long-term United States Government bonds A portfolio of Treasury bills Portfolio of junk bonds