One hundred teachers attended a seminar on mathematical problem solving. The attitudes of representative sample of 12 of the teachers were measured before and after the seminar. A positive number for change in attitude indicates that a teacher's attitude toward math became more positive. The twelve change scores are as ollows. 3; 9; 1; 2; 0; 4; 2; 1; 1; 5; 4; 3 a What is the mean change score? (Round your answer to two decimal places.) 2.00 What is the standard deviation for this sample? (Round your answer to two decimal places.) 3.67 X What is the median change score? (Round your answer to one decimal place.) 1.5 v Find the change score that is 2.2 standard deviations below the mean. (Round your answer to one decimal place.) -6.1 X