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Generic batteries cost less than brand-name batteries, but do they perform as well? A random sample...

Generic batteries cost less than brand-name batteries, but do they perform as well? A random sample of 65 generic AA batteries had a mean lifetime of 183.1 minutes with a standard deviation of 14.8 minutes. An independent random sample of 40 brand-name AA batteries had a mean lifetime of 192.5 minutes with a standard deviation of 10.5 minutes. Using these data, test using a 5% significance level whether brand-name batteries have a longer mean lifetime.

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