3 A national chain of chemist stores sells a particular brand of mouthwash. Following a reduction of
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3 A national chain of chemist stores sells a particular brand of mouthwash.
Following a reduction of 10% in the price of the mouthwash, average weekly sales per store rose from 35 to 41 bottles per week, with a 95% confi dence interval for the increase from 2.5 to 9.5.
(i) What information does the confi dence interval give about the change in sales?
(ii) Discuss whether this reduction in price should be extended.
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