"Maybe those attending private schools have higher academic aptitude — so it is not the type of school that makes the difference.”, Subject characteristics, Implementation, Maturation, Testing, “Hold on — perhaps private schools are more likely to expel the poorer students. So it’s the policy, not the nature of the school, that makes the difference.”, Loss of subjects, Subject characteristics, Instrumentation, History, “Wait a minute. Private schools may have more resources (materials, technologies, parent support); that could account for the differences instead of the type of school organization.", Implementation, Location, Regression, Testing, “Private school students may achieve higher scores, not because of the type of school, but because they are exposed to a broader range of experiences. Their parents are more affluent.”, Loss of subjects, Regression, Location, History, “Maybe private school students have more opportunities to practice taking their tests. This could account for their higher performance.”, Instrumentation, Testing, Loss of subjects, Maturation, “Is it likely that the organization.” tests to assess achievement are biased in favor of the curricula found in private schools? Could the procedure used in testing favor the private school students (testing conditions, adherence to instructions)?”, Regression, History, Instrumentation, Loss of subjects, “Perhaps it is the status and self-esteem associated with attending a private school that motivates these students to achieve at a higher level, rather than the type of school organization.”, Attitude of subjects, Subject characteristics, Implementation, Location, “Perhaps private school students spend more years in high school than those in public schools., Regression, Maturation, Subject characteristics, Implementation, “Maybe there were a lot of students who scored really low on the pretest in the private schools.”, Attitude of subject, Regression, Location, Implementation, “Maybe private schools have more experienced or dedicated teachers and this is the reason for a difference.”, Testing, Regression, Attitude of subject, Implementation

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