Determine whether the outcome is a Type I error, a Type II error, or a correct decision.
A test is made of H0: μ = 25 versus H1: μ ≠ 25. The true value of μ is 25 and H0 is rejected.
In this problem we test VS .
By the definition of a type -1 error,we reject when it is true. In the question is rejected when it is true,i.e, when .
Hence a type 1 error has been committed.
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