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 follows. 3; 8; −1; 1; 0; 5; −2; 2; −1; 6; 5; −3 a: What is the mean change score? (Round your answer to two decimal places.) b: What is the standard deviation for this sample? (Round your answer to two decimal places.) c: What is the median change score? (Round your answer to one decimal place.)
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 follows.
3; 8; −1; 1; 0; 5; −2; 2; −1; 6; 5; −3
a: What is the
b: What is the standard deviation for this sample? (Round your answer to two decimal places.)
c: What is the
d: Find the change score that is 2.2 standard deviations below the mean. (Round your answer to one decimal place.)
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