標題:
Statistics
發問:
FURTHER POST A STATISTICS QUESTION (unable to understand from the previous reply & thus pls kindly explain with detailed steps, PLUS wordings ). TKS! ==> Mean life of a shipment of lamps: 375 hr==> The process standard deviation: 100 hr==> A random sample of 64 lamps has a sample mean life of 350... 顯示更多 FURTHER POST A STATISTICS QUESTION (unable to understand from the previous reply & thus pls kindly explain with detailed steps, PLUS wordings ). TKS! ==> Mean life of a shipment of lamps: 375 hr ==> The process standard deviation: 100 hr ==> A random sample of 64 lamps has a sample mean life of 350 hr. (i) What are the null & alternative hypotheses?
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最佳解答:
i) Null hypothesis H0: Mean life μ = 375 hrs (which is the same as the given statement) Alt. hypothesis H1: Mean life μ =/= 375 hrs (which is in opposition to H0). ii) standard devistion of the mean life of the sample of 64 lamps = 100/√64 = 12.5 hours Since we are testing for if μ = 375 or not, 2-tail test will be applied, i.e. Sampled standard score z = (350 - 375)/12.5 = -2
其他解答:63D0B758E2D502CC
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