The Breaking Strengths Of Cables Produced By A Certain Manufacturer Have Historically Had A Mean Of 1825 Pounds And A St 1 (57.32 KiB) Viewed 110 times
The Breaking Strengths Of Cables Produced By A Certain Manufacturer Have Historically Had A Mean Of 1825 Pounds And A St 2 (57.32 KiB) Viewed 110 times
The breaking strengths of cables produced by a certain manufacturer have historically had a mean of 1825 pounds and a standard deviation of 70 pounds. The company believes that, due to an improvement in the manufacturing process, the mean breaking strength, H, of the cables is now greater than 1825 pounds. To see if this is the case, 17 newly manufactured cables are randomly chosen and tested, and their mean breaking strength is found to be 1844 pounds. Assume that the population is normally distributed. Can we support, at the 0.05 level of significance, the claim that the population mean breaking strength of the newly manufactured cables is greater than 1825 pounds? Assume that the population standard deviation has not changed. Perform a one-talled test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below (If necessary, consult a Ist of formulas.) (a) State the null hypothesis H, and the alternative hypothesis H. H b P x S A o 물 . (b) Determine the type of test statistic to use (Choose one) (C) Find the value of the test statistie. (Round to three or more decimal places) 0 () Find the p-value. (Round to three or more decimal places.) ロード a> X (e) Can we support the claim that the population mean breaking strength of the newly manufactured cables is greater than 1825 pounds? Yes No
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