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1) A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1000 hours A homeowner s

1) A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1000 hours A homeowner selects 25 bulbs and finds the mean lifetime tobe 980 hours with a standard deviation of 80 hours If a = 005, test the manufacturer’s claim

a a) Give the Ho and Ha and label which is the claim

b) give the pvalue

c) give your final decision about the claim

 

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