measures of dispersion

Question 1

range

Answer 1

take away the lowest from the highest number

Question 2

variance

Answer 2

-calculate the mean score from each condition
-from each participant, subtract the mean score from their score
-this would be ‘d’
-square d
-after that add all the d squared scores to get the sum (separately in each condition)
-calculate the mean of these scores and divide by n-1 (number of participants-1)

Question 3

standard deviation

Answer 3

the square root of the variance