Critical Value

  • 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).”