Mathematics, 03.11.2020 23:00 domie5910

The breaking strengths of cables produced by a certain manufacturer have a mean µ, of 1900 pounds, and a standard deviation of 70 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength. To evaluate this claim, 22 newly manufactured cables are randomly chosen and tested, and their mean breaking strength is found to be 1911 pounds. Assume that the population is normally distributed. Can we support, at the 0.01 level of significance, the claim that the mean breaking strength has increased? (Assume that the standard deviation has not changed). Carry your intermediate computations to at least three decimal places.

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