Explain how researchers could conduct a double-blind
Echinacea is an herb that may help to prevent colds and flu. Explain how researchers could conduct a double-blind, double-dummy experiment to compare echinacea tea with chewable vitamin C pills for effectiveness in preventing colds.
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echinacea is an herb that may help to prevent colds and flu explain how researchers could conduct a double-blind
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questionmake a business proposal and research a literature for the topic select and prepare a topic and propose a
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