Researchers wanted to evaluate whether a certain herb improved memory in elderly adults as measured by objective tests. To do this, they recruited 93 men and 130 women older than 60 years and in good health. Participants were randomly assigned to receive the herb, 35 mg 3 times a day, or a matching placebo. A measure of memory improvement was determined by a standardized test of learning and memory. After 6 weeks of treatment, the data indicated that the herb did not increase performance on standard tests of learning, memory, attention, and concentration. These data suggest that, when taken following the manufacturer's instructions, the herb provides no measurable increase in memory or related cognitive function to adults older than 60 years with healthy cognitive function. Complete parts (a) through (g) below.
