Researchers conducted a study to determine the influence of having a full-time job on academic grades. If they calculated an R^2 equal to .30, then what is the amount of error in the amount of variance explained by full-time employment on school grades? 1. 15% of the grades are correlated with whether or not students have a full-time job  2. 70% of the data is missing overall 3. Having a full-time job is not significantly related to academic performance 4. 30% of the total variance in grades can be predicted if they know employment status

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