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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 drinkers. Assume the population standard deviation for those drinking regular coffee is 1.20 cups per day and 1.36 cups per day for those drinking decaffeinated coffee. A random sample of 50 regular -coffee drinkers showed a mean of 4.35 cups per day. A sample of 40 decaffeinated -coffee drinkers showed a mean of 5.84 cups per day.
Use the 0.01 significance level.
a. is this a one-tailed or a two-tailed test?
b. state the decision rule.
The decision rule is to reject Ho: Regular & Decaf if Z< ___________
c. compute the value of the test statistic value of the test statistic_____
d. what is the p-value?
e. what is your decision regarding Ho?
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