Microsoft Office Tutorials and References
In Depth Information
Problems and Exercises
1. Can you ever be totally sure of the cause and effect of one variable on another
by employing sampling ? — YorN
2. Sampling errors can occur naturally, due to the uncertainty inherent in examin-
ing less than all constituents of a population—T or F?
3. A sample mean is an estimation of a population mean—T or F?
4. In our webpage example, what represents the treatments, and what represents
the response variable?
5. A coffee shop opens in a week and is considering a choice among several brands
of coffee, Medalla de Plata and Startles, as their single offering. They hope their
choice will promote visits to the shop. What are the treatments and what is the
6. What does the Chi-square test of independence for categorical data attempt to
7. What does a contingency table show?
8. Perform a Chi-squared test on the following data. What do you conclude about
the null hypothesis?
Tot a l s
9. What does a particular level of signiﬁcance,
0.05, in a test of hypothesis
10. In a chi-squared test, if you calculate a p-value that is smaller than your desired
, what is concluded?
11. Describe the basic calculation to determine the expected value for a contingency
12. Perform tests on Table E1 data. What do you conclude about the test of
a. z-Test: Two Sample for Means
t-Test: Two Sample Unequal Variances
t-Test: Paired Two Sample for Means
13. Perform an ANOVA: Two-Factor Without Replication test of the blocked data
in Table E2. What is your conclusion about the data?