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c. Is the addition of the independent variable x3 , the repairperson who performed the service, statistically significant? Use alpa=0.05 . Compute the t test

c. Is the addition of the independent variable x3 , the repairperson who performed the service, statistically significant? Use alpa=0.05 .

Compute the t test statistic for the significance of x3 (to 2 decimals). Enter negative value as negative number.

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