Mathematics, 16.10.2019 17:20 zairaefh3200
Acoffee manufacturer is interested in whether the mean daily consumption of regular-coffee drinkers is less than that of decaffeinated-coffee drinkers. assume the population standard deviation for those drinking regular coffee is 1.29 cups per day and 1.44 cups per day for those drinking decaffeinated coffee. a random sample of 55 regular-coffee drinkers showed a mean of 4.41 cups per day. a sample of 47 decaffeinated-coffee drinkers showed a mean of 5.16 cups per day. use the 0.02 significance level.
is this a one-tailed or a two-tailed test?
one-tailed test.
two-tailed test.
2) state the decision rule.
Answers: 3
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