Find the mean first = sum of scores/number of scores
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
Standard deviation = square root of variance
Use the previous process.
I'll let you do the calculations.
A company sent seven of its employees to attend a course in building self-confidence. These employees were evaluated for their self-confidence before and after attending this course. The following table gives the scores (on a scale of 1 to 15, 1 being the lowest and 15 being the highest score) of these employees before and after they attend the course.
Before 8 5 4 9 6 9 5
After 10 8 5 11 6 7 9
Test at the 1% significance level whether attending this course increases the mean score of employees.
2 answers
3523
4 answers