Mathematics, 04.05.2021 03:00, cannonkd

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Mathematics, 21.06.2019 13:00, nicolescaggs

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Mathematics, 21.06.2019 19:40, evarod

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

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HELP PLEASE!! Please don't give me sites or links, those won't work since the site is blocked!