Bivariate Analysis: Paired T-Test Flashcards
What is a Bivariate Analysis?
Statistical analysis when two variables are observed against each other
What are the Dependent Groups in a bivariate analysis?
Same group of patients that are being evaluated at different times
What are the Independent Groups in a bivariate analysis?
Different group of patients are assigned to different groups
What is continuous data?
A numeric variable that may take an infinite number of values within a given range
What is a Paired T-Test?
Continuous variable compared across matched measurements in two discrete dependent groups
What is type of test is typically based on time = pre and post?
Paired T-Tests
What is a Matched Measurement?
Two measurements are drawn from the same individual at two points in time (dependent group)
The Dependent Group in a Paired T-Test will be measured twice, once at baseline and once post-treatment, which allows for what comparison?
A Comparison of Means is made between baseline and post-treatment measurements
What can be done with the Comparison of Means in the dependent group of a Paired T-Test?
Two measurements may be correlated, a change score can be calculated = Post-Pre
When comparing dependent groups pre and post that are continuous, what statistical test is utilized?
Paired T-Test
What is the null hypothesis in a Paired T-Test?
Mean@baseline - Mean@post = 0 = no change
A Paired T-Test is a Parametric Approach meaning what?
Large sample approach
A Paired-T-Test is used to compared what?
MEANS of 2 paired (dependent/matched) groups
What are factors that influence the SIZE of the T-Statistic?
- Difference Between the Means
- Variability
- Sample Size
How does Difference Between the Means affect the T-Stat?
As the difference between the means increase, the value of t increases
