CMN3102 Lab Exam With
Complete Solution
What does a chi-square test? - ANSWER Relationship between two
categorical variables
When do you accept the null hypothesis for a chi square? - ANSWER If
observed matches expected, accept null hypothesis
If observed does not match expected, reject null hypothesis
Assumptions for a chi square (4) - ANSWER - 2 categorical variables
- Each participant can only contribute to one cell in the contingency table
- The expected frequencies for any given cell cannot be below 5
- Not using dependent/independent variables - only looking for a
relationship
How to measure effect size for chi square + levels - ANSWER Cramer's V
Falls between 0 and 1
> .5 = large association
.3 to .5 = moderate association
.1 to .3 = small association
, 0 to .1 = no association
What statistics do you report for a chi square? - ANSWER X2 (df, N = XX) =
XX.XX, p = .XXX
Cramer's V: .XXX
What does a t-test measure? - ANSWER Test if a categorical variable predicts
a continuous outcome
How many categories can the categorical variable have in a t-test? - ANSWER
Must be dichotomous - 2 categories
What is a paired samples t-test? - ANSWER Comparing the same group of
people at two points in time
What is an independent t-test? - ANSWER Comparing two different groups of
people on the same outcome
Assumptions for paired samples t-tests - ANSWER - Outcome is measured at
the continuous level
- Sample is random
Complete Solution
What does a chi-square test? - ANSWER Relationship between two
categorical variables
When do you accept the null hypothesis for a chi square? - ANSWER If
observed matches expected, accept null hypothesis
If observed does not match expected, reject null hypothesis
Assumptions for a chi square (4) - ANSWER - 2 categorical variables
- Each participant can only contribute to one cell in the contingency table
- The expected frequencies for any given cell cannot be below 5
- Not using dependent/independent variables - only looking for a
relationship
How to measure effect size for chi square + levels - ANSWER Cramer's V
Falls between 0 and 1
> .5 = large association
.3 to .5 = moderate association
.1 to .3 = small association
, 0 to .1 = no association
What statistics do you report for a chi square? - ANSWER X2 (df, N = XX) =
XX.XX, p = .XXX
Cramer's V: .XXX
What does a t-test measure? - ANSWER Test if a categorical variable predicts
a continuous outcome
How many categories can the categorical variable have in a t-test? - ANSWER
Must be dichotomous - 2 categories
What is a paired samples t-test? - ANSWER Comparing the same group of
people at two points in time
What is an independent t-test? - ANSWER Comparing two different groups of
people on the same outcome
Assumptions for paired samples t-tests - ANSWER - Outcome is measured at
the continuous level
- Sample is random
