For the hypothesis test below where the decision is reject H₀, a Type I error could have been committed. A correct discussion of the error would involve ______

A. concluding that the population mean is 90 or more when in fact the population mean is less than 90.
B. going along with the conclusion that the population mean is 90 or more when in fact it is greater than 90.
C. concluding that the population mean is less than 90 when in fact it is greater than or equal to 90.

Correct Answer: C

A Type I error is rejecting H₀ when H₀ is in fact true. In terms of this problem, this means concluding that the population mean is less than 90 (rejecting H₀: μ > 90) when in fact the mean is 90 or more (H₀: μ > 90 is true).