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.