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Which Test Should I Use? (Quantitative Data (More than 2 groups (ANOVA)…
Which Test Should I Use?
Quantitative Data
One Group
Sigma Known
H0: μ = # (by hand, z-test)
Requirements
n ≥ 30
SRS
Sigma Unknown
H0: μ = # (by excel)
Requirements
n ≥ 30
SRS
Two Groups
Paired/Dependent
H0: μd = 0
Requirements
n ≥ 30
SRS
Normality of difference
Independent
H0: μ1 = μ2
Requirements
n ≥ 30
SRS
Normality of each group
More than 2 groups (ANOVA)
H0: μ1 = μ2 = μ3 = . . .
HA: At least one mean is different
Requirements
Make a Q-Q Plot of each group to check normality
Linear Regression
Categorical Data
One Proportion (2x1)
Requirements
np ≥ 10 and n(1 - p) ≥ 10
SRS
H0: p = #
Two Proportions (2x2)
H0: p1 = p2
Requirements
np ≥ 10 and n(1 - p) ≥ 10
SRS
More than 2 Proportions
H0: rows and column variables are independent
Requirements
All expected values ≥ 5
SRS