Assume the population standard deviation

Reference no: EM13497684

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 1.41 cups per day and 1.53 cups per day for those drinking decaffeinated coffee. A random sample of 55 regular-coffee drinkers showed a mean of 4.22 cups per day. A sample of 50 decaffeinated-coffee drinkers showed a mean of 5.01 cups per day. Use the .10 significance level. (2) The decision rule is to reject if Z < ???. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) (3) The test statistic is Z = . (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) (5) The p-value is .

Reference no: EM13497684

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