[-/0.64 Points] DETAILS IDCOLLABSTAT2 2.HW.008B. MY NOTES PRACTICE ANOTHER One hundred teachers attended a seminar on mathematical problem solving. The attitudes of twelve 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 follows: 4; 9; -1; 2; 0; 5; -3; 1; -1; 6; 5; -2 What is the standard deviation for this sample? (Round your answer to two decimal places.) Additional Materials Reading