1. The Target behavior in this will be Anxiety how to track it can just be made up based off as well as the data 2. The depression data scale in the guidelines is an example of how to track data disr
Calculating Statistical significance using the Two Standard Deviation Band Method
Calculating the standard deviation
Sum the baseline scores
O1 | |
O2 | |
O3 | |
O4 | |
O5 | |
Sum of baseline scores |
Calculate mean of scores
Sum of scores/n |
Calculate the sum of squares
Scores
Ox - Mean
Square difference between O & M
Sum the squares
Find the degrees of freedom (N-1)
N-1
Calculate the Standard Deviation
Sum of squares/Degrees of Freedom | Variance = | Take the square root of the variance SD= |
Check your work. https://www.socscistatistics.com/descriptive/variance/default.aspx
Calculating the Desired zone
Multiply the baseline S.D. by 2
To get the desired zone: Subtract (2 * S.D.) from the baseline mean if goal is to DECREASE target behavior) OR Add (2 * S.D.) from the mean (if goal is to INCREASE target behavior) and (2* S.D.)
To determine if scores after intervention are IN THE DESIRED ZONE, count the number of intervention scores that are in the desired zone (2 standard deviations below or above the mean of the baseline)
If at least two consecutive data points of the intervention phase fall outside the range of the two standard deviation band of the baseline, then a significant change in performance has occurred across the two phases, since the likelihood of such an event occurring is less than 5% (Vaz, et al.,2007, p.236)
Was there a statistically significant decrease in aggressive behaviors following intervention according to the two band standard deviation method? IF TWO OR MORE CONSECUTIVE SCORES ARE IN THE DESIRED ZONE THEN YES: The change in scores is statistically significant (p<.05) if there were not at least 2 consecutie data points during the intervention phase in the desired zone, then the change was not statistically significant (occurred by chance alone).