Problem: Ryan, Hatfield, and Hofstetter investigated the effects of caffeine on memory in older adults. All participants were between the ages of 70 and 80. One group of participants was given decaf coffee, one group was given half-caf coffee, and one group was given full-strength caffeinated coffee. After finishing their coffee, participants were given 16 words to memorize. They then took both a free recall and a recognition test on the words. Need Assignment Help?