A drug company is testing a new blood pressure medication. 100 patients with high blood pressure will be divided into two groups
, A and B. Group A will be given the new medication for 30 days, while group B will receive a placebo. Which method would be best for forming the two groups? A) Let the 100 patients decide among themselves which group they wish to be in. B) Divide the 100 patients based on their family history of high blood pressure. C) Write the names on same-sized slips of paper, put them in a box, then close your eyes and choose 50. D) Select members for the two groups so that their mean blood pressures are as close to equal as possible.
I would say C. A and B make no sense, you want to divide the group randomly because you want to test the new medicine. D is a bit more logical than A and B but still can't, because that isn't random.
Since the standard deviation is the square root of variance. The only times where the standard deviation is greater than the variance is when the variance is between the values 0 and 1 exclusively. For example, the square root of 0.25 is 0.5.
