Problem: The student from Assignment #4 wanted to follow up her study of the effects of coffee on performance on a calculus exam, and examine the temporal aspects of coffee ingestion on memory and learning. She recruited 15 subjects, all who reported being regular coffee drinkers. Each subject consumed one large cup of coffee. At three time points following coffee consumption, each subject underwent a learning task followed by a memory test. In the learning task the subjects were shown a list of 25 digit-pairs (e.g. 8-5; 3-2; 4-9; etc). The subjects were instructed to add the two digits and call out the sum to the experimenter. At the end of the list of 25 digit pairs, the experimenter presented subjects with a list of 100 digit-pairs. The task for the subject was to identify whether each of the 100 digit-pairs were Òold Ò(i.e. were in the original list of 25), or were ÒnewÓ (i.e. were not in the original list). The number of correctly identified digit-pairs (out of 100) was recorded. The test was repeated 5 min, 15 min and 30 min following coffee consumption.

Conduct a repeated-measures analysis of variance on the dataset. Include a graphical display, and if necessary conduct follow-up tests between individual means. What conclusions should the student draw about the effects of coffee on learning and memory over time? Comment on the design of the experiment. Is the experimental design sound? If you were to conduct a study to address a similar question how would you design the study?

Price: $13.25

Solution: The downloadable solution consists of 8 pages, 525 words and 10 charts.
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