How does omitting a relevant variable from a regression model affect the estimated coefficient of other variables in the model? Select one: a. They are biased upward and have larger standard errors. b. They are biased and the bias can be negative or positive. c. They are biased downward and have smaller standard errors. d. They are unbiased but have larger standard errors.

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A: Hours Studying 0.5 1 1.5 2 3 3.5 4.5 Midterm Grades 63 66 68 72 74 93 94

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