13. Which of the following describes a situation in which it is reasonable to reach a cause and effect conclusion based on data from a statistical study? (a) The study is based on a random sample from a population of interest. (b) The study is observational and the sample used is not a convenience sample. (c) The study is an experiment that uses random assignment to assign volunteers to experimental conditions (treatments). m (d) The study is observational and the two samples used are not convenience samples (e) It is always reasonable to reach a cause and effect conclusion based on data from a statistical study.

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