Question

A Type I error means that a researcher has... concluded that a treatment has no effect...

A Type I error means that a researcher has...

concluded that a treatment has no effect when it really has no effect.

concluded that a treatment has an effect when it really has no effect.   

concluded that a treatment has an effect when it really does.

concluded that a treatment has no effect when it really does.

Math   Statistics-And-Probability   
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Answer: a researcher has concluded that a treatment has an effectw it really has no effect.

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