A coffee 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 1.22 cups per day and 1.33 cups per day for those drinking decaffeinated coffee. A random sample of 54 regular-coffee drinkers showed a mean of 4.55 cups per day. A sample of 48 decaffeinated-coffee drinkers showed a mean of 5.05 cups per day.
Is this a 1 tail or two tailed test?
State the decision rule( negative amount should be indicated by a minus sign. Round answers to three decimal places.)
Compute the value of test statistic ( negative amount should be indicated by a minus sign. Round answers to three decimal places.)
what is the p-value
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