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A coffee manufacturer is interested in whether the mean daily consumption of regular-coffee drinkers is less than that of decaffeinated-coffee...
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.
Use the 0.010 significance level.
A. Is this a one-tailed or a two-tailed test?
- One-tailed test.
- Two-tailed test.
B. State the decision rule. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
C. Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
D. What is the p-value?
E. What is your decision regarding H0?
- H0
- Reject H0
