If you wanted two replicates per treatments, how many experimental units would you need?   [ Select ] 8 12 27 x [ Select ] 1 2 3 = [ Select ] 12 24 36 experimental units多重下拉选择题

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A clinical trial randomly assigns participants to a new treatment or placebo and measures blood pressure; the data collected is categorized as:

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Question at position 15 The key difference between an observational study and an experiment isThe use of random selection of participantsThe number of variables that are being studiedThe ability to replicate the studyThe creation of groups of homogenous subjects to studyThe assignment of treatments to experimental units

Question at position 14 Which of the following is NOT one of the major principles in the design of experiments?All of the given options are important principles of designing experimentsCare in observing without imposing changeRandomization in assigning subjects to different treatmentsControlling for other variablesReplication of the experiment using sufficient numbers of subjects

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