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

in Table E2. What is your conclusion about the data?

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