Since a lot of times we do not have the values for X2, and X2 could be correlated both with X1 and Y, we will have to anticipate the sign of the bias, but we won't necessarily know the magnitude of the bias. Provide a list/table that gives the anticipated sign of the bias based on the relationship between X2 and X1 as well as the relationship between X2 and Y.

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The Answer of Since a lot of times we do not have the values for X2, and X2 could be correlated both with X1 and Y, we will have to anticipate the sign of the bias, but we won't necessarily know the magnitude of the bias. Provide a list/table that gives the anticipated sign of the bias based on the relationship between X2 and X1 as well as the relationship between X2 and Y.

Since a Lot of Times We Do Not Have the Values