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A Large buyer of household batteries wants to decide which of the two equally priced brands to purchase to do this, he takes a random sample of 100 batters of each brand. the life times, measured in hours, of the randomly chose batter are recorder in the file. ,,,Using the give sample data, find a 95% confidence interval for the difference between the mean lifetimes of brand 1 and brand 2 batteries. based on this confidence interval, which brand would you advise the buyer to purchase? Would you even need a confidence interval to make this recommendation? Explain?,

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