One hundred teachers attended a seminar on mathematical problem solving. The attitudes of a 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 12 change scores are as follows:

3; 8; -1; 2; 0; 5; -3; 1; -1; 6; 5; -2

Use Excel to create Descriptive Statistics table for the data above. Please upload the excel file or an image of the excel data sheet.

Use the Descriptive Statistics table created in Excel to answer the next four questions.

What is the mean change score?

What is the standard deviation for this population?

What is the median change score?

Find the change score that is 2.2 standard deviations below the mean.