In a multiple regression analysis,if the regression coefficient of a dummy variable is significant and has a sample value of 100,then the dummy variable's effect on the dependent variable is: no effect,an increase of 100,or a decrease of 100.

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The sample value of a regression coefficient does not indicate the direction or magnitude of its effect on the dependent variable. The coefficient being significant means that there is evidence that the dummy variable has a nonzero effect on the dependent variable, but further analysis is needed to determine the direction and magnitude of this effect.

In a Multiple Regression Analysis,if the Regression Coefficient of a Dummy