I was asked to:
Calculate the d value or effect size for A but use this data instead.
A. Group one 12 and group two 11 standard deviation 3
Can anyone please help me figure out how to find the d value. Any help would be great.
To calculate the d value or effect size, you will need the means and standard deviations of the groups you are comparing. In this case, you have the following information:
Group one: Mean = 12, Standard deviation = 3
Group two: Mean = 11, Standard deviation = 3
To calculate the d value, you can use the following formula:
d = (Mean1 - Mean2) / pooled standard deviation
First, calculate the pooled standard deviation, which is used to estimate the common variability between the two groups:
pooled standard deviation = √( ( (n1-1) * SD1^2 + (n2-1) * SD2^2 ) / (n1 + n2 - 2) )
Where n1 is the sample size of group one, n2 is the sample size of group two, SD1 is the standard deviation of group one, and SD2 is the standard deviation of group two.
Since you haven't provided the sample sizes for both groups, we will assume they are equal in size. Let's say n1 = n2 = n.
Using the provided information, we can calculate the pooled standard deviation:
pooled standard deviation = √( ( (n-1) * 3^2 + (n-1) * 3^2 ) / (2n - 2) )
Next, substitute the values into the formula to find d:
d = (12 - 11) / pooled standard deviation
By calculating the pooled standard deviation and substituting it into the formula, you can find the d value or effect size for group A.