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Homework answers / question archive / A music professor offers his 40 students the option of coming to an additional rehearsal session the week before their juries (musical final exams
A music professor offers his 40 students the option of coming to an additional rehearsal session the week before their juries (musical final exams.) In order to decide whether these extra sessions actually help students, he keeps track of who attends them and compares their jury scores to those of students who did not schedule extra sessions.
This study is a(n):
A) matched pairs design.
B) randomized block design.
C) nonrandomized experiment.
D) observational study.
E) completely randomized experiment
In a matched-pair design, the experimenter matches individuals in a study on some common characteristic the two share. In the randomized block design, subjects are groups according to some control variable that the experimenter can change. In randomized experiments two parallel groups are studies such as in a study of a drug with a placebo group and a group given the drug being evaluated. In an observation study, the experimenter cannot control the variable, so this seems to be a good fit. The best fit however is with answer C) nonrandomized experiment. In a nonrandomized experiment, the effect of an intervention (additional rehearsals) is studied to determine whether a postulated effect (extra rehearsal improve performance).