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#1




They have committed which of the following?
A group of researchers mistakenly conclude from a poorly designed experiment that acetaminophen cures the
common cold. They have committed which of the following? A. 1β error B. Alpha error C. Beta error D. Type I error E. Type II error 
#2




its a type I error i think.....but what is diff between type I and alpha error ????
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#3




Quote:
Arent alpha and type 1 error the same?! 
#4




Explanation:
The correct answer is D. Type I errors occur when researchers reject the null hypothesis when they should not have. In other words, they conclude a significant result when in actuality it does not exist. This is a particularly dangerous error to make, as it could lead to the administration of an ineffective drug to patients in need of lifepreserving treatment. The term "1β error" (choice A) is not used, but 1β does correspond to a meaningful value. It reflects the power of a study, which equals the probability of rejecting the null hypothesis when it is false, or in other words, the probability of discovering a true relationship (e.g., concluding that acetaminophen has antipyretic action). The term "alpha error" (choice B) is not used, but alpha values do correspond to a meaningful concept. Alpha is the probability of committing a type I error ( convicting an innocent man). Alpha corresponds to the p value (< .05) commonly used in statistical analysis. The term "beta error" (choice C) is not used, but beta values do correspond to a meaningful concept. Beta is the probability of committing a type II error( setting a guilty man free). Type II errors (choice E) occur when researchers accept the null hypothesis when it is false, thereby failing to detect a true relationship (e.g., concluding that acetaminophen has no antipyretic action). A good mnemonic for distinguishing type I and type II errors is: Type I kills everyone. Type II makes professors blue (because they can't publish their statistically insignificant results). Last edited by Novobiocin; 08052012 at 02:42 PM. 
The above post was thanked by:  
K06100 (08052012), rocketprinciple (08062012) 
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