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Consider the following model is the daily rate of return of a stock, and is the daily rate of return of the stock market as a whole, measured by the daily rate of return of Standard \& Poor's (S\&P) 500 Composite Index. Using a random sample of days from 1980, the least squares lines shown in the table below were obtained for four firms. The estimated standard error of is shown to the right of each least squares prediction equation.
For which of the three stocks, Companies B, C, or D, is there evidence (at ) of a positive linear relationship between and ?
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