Four students take Stat 271 in their second year of study at UoB and Stat 371 in their third year. They overall scores are as follows: Student 1 2 3 4 Stat 271 70 92 76 85 Stat 371 75 90 81 88 The standard deviation of stat 271 scores is 9.71, and the standard deviation of stat 371 scores is 6.86. The test statistics for testing the claim that student overall course grade are the same in both subjects is approximately O 0.4803 1.402 O -0.0551 O -0.4626