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Mathematics, 20.01.2022 23:50 Josias13

A certain herb is said to be effective in treating depression. A group of researchers
randomly assigns 200 patients with major
depression to either take the herb or a
dummy pill that looked and tasted the same.
This is an example of
A An Obsenational Study
B. Contro ed Experiment
C. A survey


A certain herb is said to be effective in treating depression. A group of researchers randomly as

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