Researchers conducted a study to determine whether magnets are effective in treating back pain Pain was measured using the

Question

Researchers conducted a study to determine whether magnets are effective in treating back pain Pain was measured using the visual analog scale and the results given below are among the results obtained in the study Higher scores correspond to greater pain levels Is this study an experiment or an observational study Explain Reduction in Pain Level After Magnet Treatment n 20 x 0 488 s 0 958 Reduction in Pain Level After Sham Treatment n 20 x 0 437 s 1 42 Choose the correct answer below OA The study is an experiment because the subjects are a systematic sample OB The study is an experiment because subjects were given treatments OC The study is an observational study because there was no attempt to modify the individuals being studied OD The study is an observational study because the subjects are a simple random sample

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