Researchers wanted to evaluate whether a certain herb improved memory in elderly adults as measured by objective tests. To do this, they recruited 89 men and 133 women older than 70 years and in good health. Participants were rando assigned to receive the herb, 30 mg 3 times a day, or a matching placebo. A measure of memory improvement was determined by a standardized test of learning and memory. (a) What type of experimental design is this? O Completely randomized design O Matched-pair design (b) What is the population being studied? O A. Adults older than 70 years and in good health O B. All adults O c. Adults older than 70 years O D. All adults in good health (c) What is the response variable in this study? O A. The number of men and women in the study O B. The age of the participants in the study Oc. The 30 mg 3 times a day O D. The score on the standardized test of learning and memory

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Researchers wanted to evaluate whether a certain herb improved memory in elderly adults as measured by objective tests. To do this, they recruited 89 men and 133 women older than 70 years and in good health. Participants were randor
assigned to receive the herb, 30 mg 3 times a day, or a matching placebo. A measure of memory improvement was determined by a standardized test of learning and memory.
(a) What type of experimental design is this?
Completely randomized design
Matched-pair design
(b) What is the population being studied?
O A. Adults older than 70 years and in good health
O B. All adults
O C. Adults older than 70 years
O D. All adults in good health
(C) What is the response variable in this study?
O A. The number of men and women in the study
O B. The age of the participants in the study
O c. The 30 mg 3 times a day
O D. The score on the standardized test of learning and memory
Transcribed Image Text:Researchers wanted to evaluate whether a certain herb improved memory in elderly adults as measured by objective tests. To do this, they recruited 89 men and 133 women older than 70 years and in good health. Participants were randor assigned to receive the herb, 30 mg 3 times a day, or a matching placebo. A measure of memory improvement was determined by a standardized test of learning and memory. (a) What type of experimental design is this? Completely randomized design Matched-pair design (b) What is the population being studied? O A. Adults older than 70 years and in good health O B. All adults O C. Adults older than 70 years O D. All adults in good health (C) What is the response variable in this study? O A. The number of men and women in the study O B. The age of the participants in the study O c. The 30 mg 3 times a day O D. The score on the standardized test of learning and memory
(d) What is the factor?
O A. 30 mg 3 times a day or a matching placebo
O B. The herb
OC. The age and health of the adult
O D. The number of men and women in the study
What are the treatments?
O A. The age and health of the adult
O B. The number of men and women in the study
OC. The herb
O D. 30 mg 3 times a day or a matching placebo
(e) Identify the experimental units. Which of the following is correct?
O A. Elderly adults
O B. Men and women older than 70 who are in good health
OC. The 89 men and 133 women older than 70 who are in good health that participated in the study
O D. The placebo and 30 mg of the herb
Transcribed Image Text:(d) What is the factor? O A. 30 mg 3 times a day or a matching placebo O B. The herb OC. The age and health of the adult O D. The number of men and women in the study What are the treatments? O A. The age and health of the adult O B. The number of men and women in the study OC. The herb O D. 30 mg 3 times a day or a matching placebo (e) Identify the experimental units. Which of the following is correct? O A. Elderly adults O B. Men and women older than 70 who are in good health OC. The 89 men and 133 women older than 70 who are in good health that participated in the study O D. The placebo and 30 mg of the herb
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