Lia doesn't like her personality psychology class because the instructor uses unannounced pop exams to test the students as a result, lila never knows when she will be tested instructor is testing her on a o foxed-ratio schedule o fxed-interval variable-ratio variable-interval

variable-interval.

to get good grades, you must study and pay attention to score high, since the tests are inconsistent and at unknown passages of time.

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answer; /// i believe that the correct answer is(

using the scientific method.