Review Question 2.16 on page 54 lists the GPAs for groups of 27 meditators and 27 non-meditators.
(a) Given that the mean GPA equals 3.19 for the meditators and 2.90 for the non- meditators, and that s 2 p equals .20, specify the observed value of t and its approximate p - value.
(b) Answer the original question about whether these two groups tend to differ.
(c) If the p - value is less than .05, use Cohen’s d to estimate the effect size.