- The observed t is 4.472
- The Critical value of t (α = .05; df = 8) is 2.306
- Since the observed value is greater than our critical value, we will reject the Null Hypothesis
- Therefore, we must accept our alternative hypothesis which stated that there is a difference between the means of our two sample groups.
- “The subjects in the New Book group did significantly better on the achievement test than those in the Old Book group (df=8; p<.05)."