Question: X - Treatment O - Observation R - Randomization describe the following designs Group A: R O1----X1-----O2 Group B: R O1-------------O2

X - Treatment O - Observation R - Randomization describe the following designs Group A: R O1----X1-----O2 Group B: R O1-------------O2

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X - Treatment O - Observation R - Randomization describe the following designs Group A: R X1-----O1-----X2-----O2 Group B: R X2-----O1-----X1-----O2

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