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 1.21 cups per day and 1.40 cups per day for those drinking decaffeinated coffee. A random sample of 54 regular-coffee drinkers showed a mean of 4.59 cups per day. A sample of 49 decaffeinated-coffee drinkers showed a mean of 5.64 cups per day. Use the 0.100 significance level. a. Is this a one-tailed or a two-tailed test? O One-tailed test. O Two-tailed test. b. State the decision rule. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) The decision rule is to reject H0: µRegular 2 µDecaf if z c. Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) Value of the test statistic

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 1.21 cups per day and 1.40 cups per day for those drinking decaffeinated coffee. A random sample of 54 regular-coffee drinkers showed a mean of 4.59 cups per day. A sample of 49 decaffeinated-coffee drinkers showed a mean of 5.64 cups per day. Use the 0.100 significance level. a. Is this a one-tailed or a two-tailed test? O One-tailed test. O Two-tailed test. b. State the decision rule. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) The decision rule is to reject H0: µRegular 2 µDecaf if z c. Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) Value of the test statistic

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

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Concept explainers

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

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 1.21 cups per day and 1.40
cups per day for those drinking decaffeinated coffee. A random sample of 54 regular-coffee drinkers showed a mean of 4.59 cups per
day. A sample of 49 decaffeinated-coffee drinkers showed a mean of 5.64 cups per day.
Use the 0.100 significance level.
a. Is this a one-tailed or a two-tailed test?
O One-tailed test.
O Two-tailed test.
b. State the decision rule. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
The decision rule is to reject H0: µRegular 2 µDecaf if z
c. Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal
places.)
Value of the test statistic

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