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A coffee manufacturer is interested in whether the mean daily consumption of regular-coffee drinkers is less...

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 1.39 cups per day and 1.55 cups per day for those drinking decaffeinated coffee. A random sample of 45 regular-coffee drinkers showed a mean of 4.59 cups per day. A sample of 39 decaffeinated-coffee drinkers showed a mean of 5.19 cups per day.

Use the 0.050 significance level.

  1. State the decision rule. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)

  1. Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)

  2. What is the p-value?

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