If you give 100 sick people tablets similar to Echinacea but with no herb (called a placebo), and do not tell them whether they are receiving the placebo or the Echinacea tablet, what kind of control would this be?

Question

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A blind control, since the sick people do not know whether they are receiving the placebo or the Echinacea

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A positive control, since you are expecting a change to happen in this control group

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A negative control, since you are expecting no change to happen in this control group

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Both a blind control and a negative control.

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If you give 100 sick people tablets similar to Echinacea but with no herb (calle...

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