Count on their hands was measured. Suppose you want to carry out a similar experiment and that you have 30 subjects who an of the hand-drying methods.
O Sort the subjects into three age groups, 18-29, 30-59 and 60+, then use a random
O Ask the subjects which of the three hand-drying methods they prefer using, and then
O Ask the subjects which of the three hand-drying methods they prefer using, and then
O Write the names of the thirty subjects on pieces of paper and put them in a hat.