Question 4 A sample of n 25 individuals is selected from a

Question 4 A sample of n = 25 individuals is selected from a population with Mu = 80, and a treatment is administered to the sample. Which set of sample characteristics is most likely to lead to a decision that there is a significant treatment effect? M = 85 and small sample variance M = 90 and small sample variance M = 90 and large sample variance M = 85 and large sample variance

Solution

Second option is the most appropriate because the change in mean is large. Also the variation decreased which means the value of statistic z would be obtained higher hence I\'ll choose the second option.