Two Sample t-test Calculations Using VassarStats

Navigate the website in this order:

• Select t-Tests & Procedures from side menu
• Select t-Test for Independent or Correlated Samples
• Select either Independent or Correlated (Dependent) Samples
• Enter data and press “Calculate”
• Output you want consists of computed t-score, df, and p-value

Note for Two Sample t-test, the null hypothesis is H₀ : µ₁ = µ₂

11.5 - dependent

t = -3.97 p-value = 0.0011 df = 16 Reject H₀ at α = 5%

11.16 - dependent

t = -3.27 p-value = 0.0061 df = 13 Reject H₀ at α = 5%

11.17 - dependent

t = -2.70 p-value = 0.021 df = 11 Reject H₀ at α = 5%

11.20 – independent, sample means 51.44 and 51.37

t = 0.05 p-value = 0.961 df = 19 Accept H₀ at α = 5%

11.21 – independent, sample means 48.27 and 44.5

t = 0.58 p-value = 0.568 df = 21 Accept H₀ at α = 5%