A coffee manufacturer is interested in whether the mean daily consumption of regular-coffee drinkers is less than
Question:
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 .01 significance level.
a. State the null and alternate hypotheses.
b. Compute the test statistic.
c. Compute the p-value.
d. What is your decision regarding the null hypothesis?
e. Interpret the result.
Step by Step Answer:
Statistical Techniques In Business And Economics
ISBN: 9781260239478
18th Edition
Authors: Douglas Lind, William Marchal, Samuel Wathen