1. Active Learning Lecture Slides
Chapter 18 Inference for Counts
Active Learning Lecture Slides
For use with Classroom Response Systems

2. The most common null hypothesis for a chi-squared test specifies that the variables that define a contingency table are…
dependent.
independent.
differences in distribution might be the result of sampling variation.
all of the above.

3. The most common null hypothesis for a chi-squared test specifies that the variables that define a contingency table are…
dependent.
independent.
differences in distribution might be the result of sampling variation.
all of the above.

4. A chi-squared test is a hypothesis test based on the size of the chi-squared statistic.
True
False

5. A chi-squared test is a hypothesis test based on the size of the chi-squared statistic.
True
False

6. A chi-squared test of independence tests the independence of two categorical variables using counts in a contingency table.
True
False

7. A chi-squared test of independence tests the independence of two categorical variables using counts in a contingency table.
True
False

8. The conditions needed for chi-squared test of independence are…
no obvious lurking variables.
SRS condition.
sample size condition.
table categories are mutually exclusive.
all of the above.

9. The conditions needed for chi-squared test of independence are…
no obvious lurking variables.
SRS condition.
sample size condition.
table categories are mutually exclusive.
all of the above.

10. The sampling distribution of the chi-squared statistic if the null hypothesis is true is called the…
normal distribution.
chi-squared distribution.

11. The sampling distribution of the chi-squared statistic if the null hypothesis is true is called the…
normal distribution.
chi-squared distribution.

12. A chi-squared distribution is closely related to a normal distribution, and looks very similar.
True
False

13. A chi-squared distribution is closely related to a normal distribution, and looks very similar.
True
False

14. Each chi-squared distribution is identified by a parameter known as the…
p-value.
degrees of freedom.
goodness of fit.
none of the above.

15. Each chi-squared distribution is identified by a parameter known as the…
p-value.
degrees of freedom.
goodness of fit.
none of the above.

16. The p-value is the area beneath the chi- squared distribution to the right of the observed statistic.
True
False

17. The p-value is the area beneath the chi- squared distribution to the right of the observed statistic.
True
False

18. The chi-squared test is a general test and cannot match the power of a more specific test.
True
False

19. The chi-squared test is a general test and cannot match the power of a more specific test.
True
False

20. A test of the distribution of a single categorical variable is called the…
p-test.
degrees of freedom.
chi-squared test of goodness of fit.
test for randomness.

21. A test of the distribution of a single categorical variable is called the…
p-test.
degrees of freedom.
chi-squared test of goodness of fit.
test for randomness.