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4. Consider the following regression model Y = Bo+ BIX1+ B2X2 + B3X3 + BAX4 After fitting the above model, we find that X1 is

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4. Consider the following regression model Y = Bo+ BIX1+ B2X2 + B3X3 + BAX4 After fitting the above model, we find that X1 is statistically significant. However, when we fit the simple linear regression model Y = Bo + BIX1 we find that X1 is not statistically significant. What is your conclusion for the independent variables X1, X2, X3 and X4

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