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Version 1 13 group 11 personnel testthe personnel

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group --------11)Personnel TestThe personnel department of a large manufacturing firm selected a randomsample of 23 workers. The workers were interviewed and given several tests. On the basis of thetest results, the following variables were investigated: X2= manual dexterity score, X3= mentalaptitude score, and X4= personnel assessment score.Subsequently, the workers were observed inorder to determine the average number of units of work completed (Y) in a given time period foreach worker. Regression analysis yielded these results:y = −212+ 1.90X2+ 2.00X3+ 0.25X4Adjusted R2= 0.75.(0.50)(0.060)(0.20)Note: The numbers shown in parentheses below the coefficients are the standard errors of thecoefficients.The quantities in parentheses are the standard errors of the regression coefficients.The standard error of the regression is 25, and the standard deviation of the dependent variable is50.Which of the following statements is the correct interpretation of the mental aptituderegression coefficient?
12)In using quarterly time series data, which quarter can serve as the base period forinterpretation of dummy variables?

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