Question 1 (1 point) Question 1: Chi-square test for independence assesses which
ID: 3060112 • Letter: Q
Question
Question 1 (1 point)
Question 1: Chi-square test for independence assesses which of the following?
Question 1 options:
It assesses whether there is a relationship between the population and the sample.
It assesses whether there is a relationship between two categorical variables.
It assesses whether there is significant difference between scores taken at time 1 and those taken at time 2.
It assesses whether the minimum number of cases exceeds recommended boundaries.
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Question 2 (1 point)
Question 2: Which tests could be used if in a contingency table your expected cases were fewer than what is required for the Chi-square test?
Question 2 options:
Chi-square test for independence.
Two-independent sample t-test.
Fisher's Exact Probability Test.
Paired-samples t-tests.
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Question 3 (1 point)
Question 3: Contingency tables and degrees of freedom are key elements of the chi-square test.
Question 3 options:
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Question 4 (1 point)
Question 4: For the chi-square test to be effective, the expected value for each cell in the contingency table has to be at least:
Question 4 options:
1
5
10
the number of rows times the number of columns.
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Question 5 (1 point)
Question 5: When an odds ratio is calculated from a 2x2 table:
Question 5 options:
The odds ratio is a measure of the strength of the relationship between the risk factor and disease variables.
The ratio may take any positive or negative value.
An odds ratio of 5 indicates there is no increase in odds of disease among the exposed group.
An odds ratio of 0.50 indicates there is an increase in odds of disease among the exposed group.
It assesses whether there is a relationship between the population and the sample.
It assesses whether there is a relationship between two categorical variables.
It assesses whether there is significant difference between scores taken at time 1 and those taken at time 2.
It assesses whether the minimum number of cases exceeds recommended boundaries.
Explanation / Answer
1. Chi-square test for independence is used to determine if there is a significant relationship between two nominal (categorical) variables. So the second option is correct: It assesses whether there is a relationship between two categorical variables.
2. if in a contingency table expected cases were fewer than what is required for the Chi-square test, categories may be combined (if it makes sense to do so) to create fewer larger categories. Alternatively, Fisher’s exact test can be used.
Option 3 is correct: Fisher's Exact Probability Test.
3. The first option is correct. TRUE.
4. As a general rule, the chi-squared test is appropriate if at least 80% of the cells have an expected frequency of 5 or greater.
The second option is correct: For the chi-square test to be effective, the expected value for each cell in the contingency table has to be at least: 5
5. Option 1 is correct: The odds ratio is a measure of the strength of the relationship between the risk factor and disease variables