Experimental and Quasi-experimental Designs for Research |
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Page 5
... Factors Jeopardizing Internal and External Validity In the next few sections of this chapter we spell out 12 factors jeopardizing the validity of various experimental designs.3 Each fac- tor will receive its main exposition in the ...
... Factors Jeopardizing Internal and External Validity In the next few sections of this chapter we spell out 12 factors jeopardizing the validity of various experimental designs.3 Each fac- tor will receive its main exposition in the ...
Page 16
... Factors Jeopardizing External Validity The factors of internal invalidity which have been described so far have been factors which directly affected O scores . They have been factors which by themselves could pro- duce changes which ...
... Factors Jeopardizing External Validity The factors of internal invalidity which have been described so far have been factors which directly affected O scores . They have been factors which by themselves could pro- duce changes which ...
Page 31
... factors are random or fixed . A simple explanation of these extensions was given by Ferguson ( 1959 ) . Rather than present formulas , we shall use a verbal illustration to show how finite , random , and fixed selection of levels of a ...
... factors are random or fixed . A simple explanation of these extensions was given by Ferguson ( 1959 ) . Rather than present formulas , we shall use a verbal illustration to show how finite , random , and fixed selection of levels of a ...
Contents
PREFACE | 1 |
SUBJECT INDEX | 5 |
THREE TRUE EXPERIMENTAL DESIGNS 13 115 | 13 |
Copyright | |
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achieved analysis analysis of variance attitudes causal classroom comparison confounded CONTROL GROUP DESIGN correlation covariance Design 12 design of experiments differences discussion educational research effect of X employed equivalent error ex post facto experimental and control experimental control experimental design experimental effect experimental group experimental variable external factors gain hypothesis inference interaction effect internal validity interpretation interviewers involved Kempthorne Latin squares main effect matching maturation measures memory bias ment mental methods O₁ and O2 occasions occur perimental persons plau plausible rival population possible posttest scores present pretest and posttest pretest scores pretest-posttest problem procedures Psychol psychology psychotherapy pupils quasi-experimental designs quasi-experiments random assignment randomly regression Regression fallacies relevant represent research on teaching rival hypotheses rx,o sampling selection settings shift sible sources of invalidity specific Stanley statistical Table teachers ternal validity tests of significance time-series tion trol group true experiment usually