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In the equation yi = 0 +1zi+ ei, zi is 0 if the ____. Question 4Answer a. ith unit residual is less than equal to

In the equation yi = 0 +1zi+ ei, zi is 0 if the ____. Question 4Answer a. ith unit residual is less than equal to the mean residual b. ith unit is in the comparison group c. ith unit residual is greater than the mean residual d. ith unit is in the treatment group

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