Question: Using which experimental design type can a researcher establish change? (Hint: time is essence for a change to be established) 1. After-only design II. One

Using which experimental design type can a researcher establish change? (Hint: time is essence for a change to be established) 1. After-only design II. One group before-after design III. Two group ex-post facto design IV. Two group before-after design I and II O II and IV III and IV O I, II and III Previous

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