a treatment is administered to a sample of n=4 individuals is selected from a population with a mean of u=80 and a standard deviation of o=10. After treatment the effect size is measured by comparing Cohen\'s d, and a value of d=0.60 is obtained. Based on this information what is the mean for the treated sample? a-M=6 b-M=83 c-M=86 d- Cannot answer without knowing the sample size Solution c-M=86.