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.