I failed to reject null, but I computed cohen's d to be -.96. Is there a mistake in my computation or is there a different explanation for this?

Stat 115 Spring 2021 b. State the alternative hypothesis in words and a statistical form (1). using e- books will lower students' scores H18 2 82 c. Compute the appropriate statistic to test the hypotheses. Sketch the distribution with the estimated standard error and locate the critical region(s) with the critical value(s) (3). t = M- M a = 0.0 1 Sm 4 Dom = 1.9 df = 8 critical Region t = 76.5- 82 t = - 2. 896 9 9 90 5. 7Na 2- 2.895 $ 5- 2. 896 5 - 5.7 5,7 = 1.9 1 = - 2.895 - 2 . 895 2 - 2:896 d. State your statistical decision (.5). Fall to reject Hop e. Compute Cohen's d. Interpret what this d really means in this context (2). Cohen's d = M- M - 76.5-82 - - 5.5 - 96 S 5.7