Question

Professor Kirk concluded that a new medication significantly lowers patients' risk of heart attack. However, it...

Professor Kirk concluded that a new medication significantly lowers patients' risk of heart attack. However, it turns out that the drug has no effect. Professor Kirk has made a(n)

Type I error.

Type II error.

Type III error.

omnibus error.
Math   Statistics-And-Probability   
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Answer #1

In the test, the null hypothesis will be the drug has no effect and the alternative hypothesis will be the drug lowers the patients' risk of heart attack. The doctor has concluded that the new medication lowers patients risk of heart attack however, it turns out that the drug has no effect. So, he has rejected the null hypothesis when it is true. Rejecting the null hypothesis, when it is actually true will lead to Type I error.

That is, he made a Type I error.

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