Mathematics, 30.11.2019 06:31 martinbricein10

Abolt manufacturer is very concerned about the consistency with which his machines produce bolts. the bolts should be 0.26 centimeters in diameter. the variance of the bolts should be 0.025. a random sample of 11 bolts has an average diameter of 0.25cm with a standard deviation of 0.0661. can the manufacturer conclude that the bolts vary from the required variance at α=0.05 level?

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