You own a stock portfolio invested 25 percent in Stock Q, 35 percent in Stock R, 18 percent in Stock S, and 22 percent In Stock T. The betas for these four stocks are 1.3, 0.7, 1.4, and 0.9, respectively. What is the portfolio beta? (Do not round intermediate calculations. Round your answer to 3 decimal places.) Portfolio beta

EXERCISES The following table gives the life expectancy at birth of females born in the United States in various years from 1970 to 2010. Source: National Center for Health Statistics. Year of Birth Life Expectancy years 1970 74.7 1975 76.6 1980 77.4 1985 78.2 1990 78.8 1995 78.9 2000 79.3 2005 79.9 2010 81.0 Find the life expectancy predicted by your regression equation for each year in the table, and subtract it from the actual value in the second column. This gives you a table of residuals. Plot your residuals as points on a graph.