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Does the level of octane in gasoline affect gas mileage? To answer this question, an automotive engineer obtains 60 cars. Twenty of the cars are compact, 20 are full size, and 20 are sport utility vehicles (SUVs) Design an experiment for the engineer What type of experimental design should the engineer use? O A. Completely randomized design O B. Randomized block design O C. Matched pair D. Case-control

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The type of experimental design that should be used by the engineer is Randomized block design. Reason: The sixty cars are divided into three groups; each group contains 20 each Therefore, the population under study is divided into groups from which the sample is drawn randomly, and the technique is called as Randomized block design. Hence the correct option is Randomized block design [B] The study is an experimental because the study examines individuals in a sample but does not try to influence the variable of interest. The correct option is [c]

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