In a study of the effect of class size on the performance of students, researcher estimates the following regression, Test Score Bo + B,STR. +3,Pet ELi + i, where Test Score is the average of the standardized test scores, STR is the districtwide student-teacher ratio and PetEL is the percentage of English learners in the school district. The researcher now wishes to test the following hypothesis: Ho H₁: 3₁-232, ₁282. Describe a suitable transformation of this regression so that the hy- pothesis can be tested using a t-statistics.

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