One hundred teachers attended a seminar on mathematical problem solving. The attitudes of representative sa for change In attitude indicates that a teacher's attitude toward math became more positive. The twelve change 3; 8; -1; 1; 0, 4; 3: 2; -1; 5; 4; -2 Part (a) What is the mean change score? (Round your answer to two decimal places.) 1.67 Part (b) What is the standard deviation for this sample? (Round your answer to two decimal places.) 13.2 Part (c) What is the median change score? (Round your answer to one decimal place.) 1.5 Part (d) Find the change score that is 2.2 standard deviations below the mean. (Round your answer to one decimal place.)