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
response variable?
6. What does the Chi-square test of independence for categorical data attempt to
suggest?
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?
Coffee Drinks
Customer Type
Coffee
Latte
Cappuccino
Soy-based
Totals
Male
230
50
56
4
Female
70
90
64
36
Tot a l s
600
9. What does a particular level of signiﬁcance,
α =
0.05, in a test of hypothesis
suggest?
10. In a chi-squared test, if you calculate a p-value that is smaller than your desired
α
, what is concluded?
11. Describe the basic calculation to determine the expected value for a contingency
table cell.
12. Perform tests on Table E1 data. What do you conclude about the test of
hypothesis?
a. z-Test: Two Sample for Means
b.
t-Test: Two Sample Unequal Variances
c.
t-Test: Paired Two Sample for Means
13. Perform an ANOVA: Two-Factor Without Replication test of the blocked data