t tests

• Paired (Correlated)
• Independent
  • Pooled (Equal Variance)
  • Separate (Unequal Variance)

Effect Size
p (Statistical Significance)
Mean Table
Null & Alternative Hypotheses

Factors Influencing Statistical Significance

• Effect Size (Difference Between the Means)
• Standard Deviation (sd)
• Number of Subjects (n)
• p-level
• Direction