sing a computer-based list of registered students, 200 freshmen, 200 sopho- ors
ID: 3199151 • Letter: S
Question
sing a computer-based list of registered students, 200 freshmen, 200 sopho- ors and 200 seniors were selected at random from each of these four 3. (5 points) U mores, 200 juni classes. What kind of sampling design was employed? 4. (15 points) Researchers wanted to evaluate whether ginko, an over-the-counter herb marketed as enhancing memory, improves memory in elderly adults as measured by objective tests. To do this, they recruited 200 people older than 60 years of age and in good health. Participants were randomly assigned to receive day, or a matching placebo. The measure of memory improvement after 6 weeks was determined by a standardized test of learning and memory (a) (2 points) What type of experimental design was this? ginko, 40mg 3 times per (b) (2 points) What is the population being studied? (c) (2 points) What is the response variable in this study? (d) (2 points) What is the factor? (e) (2 points) What are the treatments? (f) (5 points) Draw a diagram experiment outlining the experiment (your diagram should have the same structure as the ones done in class or in the book).Explanation / Answer
Answers
Q3
The population of registered students is divided into 4 groups (strata) and from each group a random sample is taken to make a composite sample to derive information about the population. Thus, it is a case of Stratified Random Sampling ANSWER
Q4a
Experimental units (200 recruited people) are randomly but equally divided into two groups – each group receiving one treatment.
Thus. it is a case of Completely Randomised Design (CRD) ANSWER
Q4b
Population of elderly adults (over 60 years of age) ANSWER
Q4c
Measure of memory improvement as determined by a standard test of learning and memory ANSWER
Q4d
Factor: Memory improvement ANSWER
Q4e
Treatments: Ginko, an over-the-counter herb claimed to improve memory and Placebo – first acting as treatment and the second acting as control. ANSWER
DONE
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