When an inspection process rejects conforming product, what type of error is being made?

The correct answer is A. α. Rejecting conforming (good) product is a Type I error, denoted by α (alpha) - you are incorrectly rejecting the null hypothesis (H0: product is good) when it is actually true. In quality inspection terms, this is also called a "producer's risk" because good product is wrongly…

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(42 responses)

A
74% (31)
B
7% (3)
C
17% (7)
D
2% (1)

Explanation

Rejecting conforming (good) product is a Type I error, denoted by α (alpha) - you are incorrectly rejecting the null hypothesis (H0: product is good) when it is actually true. In quality inspection terms, this is also called a "producer's risk" because good product is wrongly thrown out. β (beta) is wrong because it represents a Type II error - accepting non-conforming product (passing bad product through), which is the opposite scenario. σ (sigma) is simply the symbol for standard deviation and has nothing to do with decision errors. H0 is the null hypothesis itself (the statement being tested), not a type of error.

Memory tip: Think α = "Alarm goes off wrongly" (false alarm - you rejected good product) and β = "Bad slips By" (bad product passes through undetected).

Topics

#type I error#alpha error#inspection error#measurement error

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