The manufacturer of compact disc players wants to test whether a small price reduction is enough to increase the sales of their product. Randomly chosen data on 15 weekly sales total at outlets in a given area before the price reduction show a sample mean of 6598 and a sample standard deviation of *844. A random sample of 12 weekly sales after the small price reduction gives a sample mean of '6870 and a sample standard deviation of `669. Is there evidence that the small price reduction is enough to increase sales of compact disk players? Take a = 0.05.
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Why is distilled water used in the batteries and not the tap water?
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