A biologist wants to test the null hypothesis that themean wingspan of a certain kind of insect is 12.3 mmagainst the alternative that it is not 12.3 mm. If shetakes a random sample and decides to accept the nullhypothesis if and only if the mean of the sample fallsbetween 12.0 mm and 12.6 mm, what decision will shemake if she gets x = 12.9 mm and will it be in error if(a) μ = 12.5 mm; (b) μ = 12.3 mm?

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