My teacher's comment: Problem 1e and 1f wrong choice of formula thus, it matters with your answers.

Please help me find what will be the right answer. See the attached picture. Thanks!

1 Based on the data premed below, answer the following objectively PROTEST POST-TEST a) what is the prefect mean scene ? b) what is the are teat mean scou ? 67 . Pre-test mean scare 3 54 +56 + 51+ 16+621 61+85 + 79+ 59+581 76+71 76 tastes tait Gat saton top +80tea+ 631 75+ 63 80 715 EX= 1458 N= 25 85 85 1658 - 25 = 46-327 79 48 D 64. 32 - the tent mean score then port test ( pose po sou litter of mamaya ) 10 76 " Part -fest mean - score 12 84 the same way of computing , I derived at 84 1812 - 25 = 12.48 * 12.48 In the pacttest mean score 15 69 43 () What is the standard deviation by pre-test score? 59 *- population campe "- mate 18 75 19 75 69-64.32)3 + (87-46:32 ) 2 + 75-66.32) 20 80 82 = 3677.54 21 8Q 80 12.12837994/278 22 43 2/5 75 75 24 81 ( ) what is the standard deviation of past-test 5 57 ganum nopo P= 55-7248) 165-72 48 +85-7248) 1982.24 8. 904 470787 1945Ho . M-M - Hr - Mom - ( two tures ) DA 8.05 15.18 837 994/ 278 from 1. 7956 9 155 + (0. 28 2842712)X 3. 43042 207472 Ja = 1179509645 5 between the pre-test ance of get fat Room pt = 12 49- 606.72 8. 904470787/945 ) 51/as + 1/25 It 24 40 from 2,44583 7033 = 6.14 8 . 518 51 464637 = 2,445874593