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18) In a cross-sectional study, data are A)observed, measured, and collected at one point of time B) observed, measure, and collected over a period of time C) collected from a past time period D)collected in the future from groups that share common factors 19) Which type of experiment separates subjects into groups that aremilar but differ in ways that might affect the outcome of the experiment? A) Completely randomized design C) Matched pairs design B) Randomized block design D) Rigorously controlled design 20) The good design of experiments includes blinding and 20) A) replication; voluntary response samples B) internalization; randomization C) replication; experimentation D) replication; randomization
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18) option A is correct ; at one point of time

19) randomized block design : option B

20) option D is correct

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