perate continuously for at least 7 minutes longer than the old battery. To test the claim, the company selects a nple random sample of 100 new batteries and 100 old batteries. The old batteries run continuously for 190 inutes with a standard deviation of 20 minutes; the new batteries, 200 minutes with a standard deviation of 40 inutes. Test the engineer's claim that the new batteries run at least 7 minutes longer than the old. Use a 0.05 vel of significance. (Assume that there are no outliers in either sample.) hat is the null hypothesis? hat is the alternative hypothesis? hat is the test statistic to be used? hat is the appropriate critical region? hat is the actual value of the test statistic? hat is the statistical decision? hat is the statistical conclusion?

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