Tests Flashcards
What do we use the Z-test for?
Making a comparison between a sample and it’s population to see if it fits
In the Z-test, if |Z-Calc| > Z-crit, we accept…
H₁
What do we use the T-test for?
Making a comparison between a sample and it’s population, where the sample is less than 30 (n<30)
In the T-test, if |T-calc| > T-crit, we accept…
H₁
What do we use the Z proportion test for?
Comparing populations with expected portions, to actual portions and seeing if they’re statistically different
In the Z proportion test, if |Z-calc| > Z-crit, we accept…
H₁
What do we use the Mann-Whitney U-test for?
For comparing two independent samples to each other, using ranks (ordinal data)
In the Mann-Whitney U-test, if the U-stat > U-crit, we accept…
H₀
What do we use Chi Squared for?
Evaluating categorical data of frequencies
In Chi Squared, if Chi-calc > Chi-crit, we must accept…
H₁
What is the F-test for?
Comparing if variances are statistically different
In the F-test, if S²₁ = S²₂, we must accept…
H₀
What is ANOVA used for?
Measures the variation between samples relative to the variation within the samples
What value do we find using ANOVA?
The F value
What is Pearson’s r used for?
Measures the variability between two datasets
What value do we find using Pearson’s r?
The T value
What is Spearman’s RCC for?
Comparing the variability of two datasets but using ranks
What value do we find using Spearman’s r?
The T value
What is linear regression?
Finding the best line of fit on a scatterplot
What is the equation for linear regression?
y = a + bx
What does (a) represent in the linear regression formula?
The intercept of the line of best fit
What does (b) represent in the linear regression formula?
The slope of the line of best fit
