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Suppose we want to understand the impact of total student enrollment on high school's graduation rate. And we run the pooled model: GradRateu = [30 + lE-n'rollmcntn + an, GradRate is the graduation rate for school i in year t. Enrollment\" is the total student enrollment for school 3' in year t a What is in the error term? Explain this in general terms instead of specic exalnples. b Are there any time stable unit-specic elements in the error term? (2 Are the time stable unitspecic elements in the error term likely to be correlated with the independent variable? (1 Are there any unit stable time-specic elements in the error term