Which one of the following is the optimal way to take a sample for a study on the calorie content of sandwiches at all fast food restaurants?
randomly select a chicken sandwich and a beef burger from one of the restaurants as the sample
o create two categories, one of sandwiches and one of another menu option at all fast food restaurants, and take a random sample
from all the fast food restaurants
create two categories, one with chicken sandwiches and one with beef burgers and take a random sample from all the fast food
restaurants
categorize all the fast food restaurants into one group and take a random sample of all sandwiches

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: minus2.00, minus1.00, 0, 1.00, 2.00? why? a. the z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores. b. the z score of 0 is most preferable because it corresponds to a test score equal to the mean. c. the z score of minus2.00 is most preferable because it is 2.00 standard deviations below the mean and would correspond to the highest of the five different possible test scores. d. the z score of minus1.00 is most preferable because it is 1.00 standard deviation below the mean and would correspond to an above average