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1.1
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A. To determine the influence of a variable on one group and not on another.
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1.2
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B. To investigate a situation in which random selection and assignment are not possible.
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1.3
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C. To investigate the possible effect of pre-testing.
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1.4
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D. To explain a consequence in terms of its antecedent.
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1.5
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E. To evaluate the influence of a variable.
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1.6
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F. To study the effect of an influence on a carefully controlled sample.
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1.7
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G. To determine the influence of a variable introduced after a series of initial observations, when only one group is available.
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1.8
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H. To evaluate a situation that cannot or should not be pre-tested.
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1.9
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I. To improve the validity of the times series experimental design by adding a control group.
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1.10
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J. A variant of the control group, time series design to control for the effects of outside events.
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