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A coffee manufacturer is interested in estimating the difference in the average daily coffee consumption of regular-coffee drinkers and...
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A coffee manufacturer is interested in estimating the difference in

the average daily coffee consumption of regular-coffee drinkers and decaffeinated-coffee drinkers. A random sample of 15 regular-coffee drinkers and a random sample of 11 decaffeinated-coffee drinkers are selected. For each selected individual, the number of cups of coffee consumed per day is recorded. The sample mean and the sample standard deviation of the two groups of coffee drinkers are summarized below.


Groups Mean Sample std. dev. Regular-coffee drinkers 2.60 1.18 Decaffeinated-coffee drinkers 2.09 0.72


Use the critical value approach and a significance level of 10%, test the hypothesis that the mean number of cups of coffee consumed per day is different for the two groups of coffee-drinkers. (Use df = 24.)

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