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A Coffee Manufacturer Is Interested In Whether The Mean Daily Consumption Of Regular-Coffee Drinkers Is Less Than
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 1.29 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 .02 significance level.
The decision rule is to reject H0 : μr ≥ μd if z < ______________ (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.)
The test statistic is z = ______________ (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.
What is the P-value ______________( round to four decimal places) .
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