PSYC-212 Lecture Notes - Lecture 8: Repeated Measures Design, Statistical Power, Internal Validity

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Chapter(10:(
!Types(of(Within(Subjects(designs:(
o!Pretest<posttest(design:(a(within(subjects(design(where(participants(are(
measured(before(and(after(exposure(to(a(treatment(or(intervention(
!!Measuring(participants(twice(on(the(same(dependent(variable(
!!Baseline(measurement:(participant(initial(assessment(at(beginning(of(a(
study(
o!Repeated(measures(design:(participants(are(exposed(to(each(level(of(
independent(variable(and(are(measured(on(the(dependent(variable(after(each(
level((
!!No(baseline(measurement(
(
!The(advantages(of(Within(subjects(design:(
o!Statistical(power(–(can(address(research(questions(involving(change(or(relative(
comparisons(
o!Fewer(participants(needed(
o!Individual(difference(are(constant(across(comparison(groups(
(
!Internal(Validity(Problems(
o!Attrition/morality(–(differential(dropping(out(of(participants(from(a(study(
!!Possible(solution:(make(continuation(in(the(study(
appealing/nonthreatening(
(
o!Instrumentation(–(threat(to(internal(validity(due(to(changes(in(how(a(variable(is(
measured(during(the(course(of(a(study(
!!Maintain(consistency(in(measurement(instrument(and(how(it’s(
administered(through(the(study(
(
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