Posted by Donna on Monday, March 25, 2013 at 2:17pm.
The average amount spent at a fastfood restaurant in California was $3.30, with a standard deviation of $.40. Yet in Georgia, the average amount spent at a fastfood restaurant was $3.25, with a standard deviation of $.10. What do these statistics tell you about fastfood consumption patterns in these two states?

statistics  PsyDAG, Monday, March 25, 2013 at 3:18pm
Ho: mean1 = mean2
Ha: mean1 ≠ mean2
Z = (mean1  mean2)/standard error (SE) of difference between means
SEdiff = √(SEmean1^2 + SEmean2^2)
SEm = SD/√n
If only one SD is provided, you can use just that to determine SEdiff.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score to see if there is a significant difference in terms of whatever level of significance level you choose.