A publisher develops a statistics textbook with a different layout from the typical textbook and was interested in whether the new layout was beneficial or detrimental to learning statistics. On a national statistics exam, = 68.5 for students using other textbooks. A sample of 10 students using the new book has M(a) What are H₀ and H_a for this study? (b) Compute t. (c) With = 0.05 what is the critical t-value? (d) What do you conclude about the use of this book? (e) Compute Cohen's d, r², and the 95% confidence interval for if appropriate and interpret the results.