Dr.Kalmagura plans on introducing a new exam review procedure in his chemistry classes.To check the effectiveness of the new procedure he is going to have half his students try the new technique for one semester,while the remaining students review in the way they have always done in the past.He asks each student to decide which of the techniques they would like to use,the new technique or the standard technique.In this example,Dr.Kalmagura's procedure illustrates

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Dr.Kalmagura's procedure involves non-random assignment because he is allowing the students to choose which technique they want to use, rather than randomly assigning them to a group. This could introduce bias into the study as certain types of students may be more likely to choose one technique over the other.

DrKalmagura Plans on Introducing a New Exam Review Procedure in His