highly significantp < 0.001
The mean difference between the two classes (4.6 years) is highly significant (comparison of annual means against a null hypothesis of Δμ = 0: F 1,60 =74.8, p < 0.001).
The mean difference between the two classes (4.6 years) is highly significant (comparison of annual means against a null hypothesis of Δμ = 0: F 1,60 =74.8, p < 0.001).