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A study is to be conducted with four horror films to determine which causes more nightmares The researcher grouped the 500 participants into groups easily

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A study is to be conducted with four horror films to determine which causes more nightmares The researcher grouped the 500 participants into groups easily scared moderately scared hardly scared and randomly selected 40 participants from each group What type of sampling method was used O Simple random sample O Census Cluster sample Stratified sample

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