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(Solved): A manufacturer claims that their product will last, on average 6 years with a standarddeviation of 1 ...



A manufacturer claims that their product will last, on average 6 years with a standarddeviation of 1 year. If 5 randomly selected products give an average lifetime of 3 years and a standarddeviation of 2 years. Assume the product lifetime to be approximately normally distributed.i.A 90% confidence interval for the standard deviation



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