16. Shrinking Stomach? Researchers wanted to determine whether the stomach shrin
ID: 141585 • Letter: 1
Question
16. Shrinking Stomach? Researchers wanted to determine whether the stomach shrinks as a result of dieting. To do this, they randomly divided 23 obese patients into two groups. The 14 individuals in the experimental group were placed on a diet that allowed them to consume 2508 kilojoules (kJ) per day for 4 weeks The 9 subjects in the control group ate as they normally would. To assess the size of the stomach, a latex gastric balloon was inserted into each subject's stomach and filled with the maximum amount of water that could be tolerated by the patient. The volume of water was compared to the volume that could be tolerated at the beginning of the study. The experimental subjects experienced a 27% reduction in gastric capacity, while the subjects in the control group experienced no change in gastric capacity. It was concluded that a reduction in gastric capacity occurs after a restricted diet. Source: A. Geliebter et al."Reduced Stomach Capacity in Obese Subjects after Dieting." American Journal of Clinical Nutrition 63(2):170-173, 1996 (a) What type of experimental design is this? (b) What is the population that the results of this experiment apply to? (c) What is the response variable in this study? Is it qualitative or quantitative? (d) What are the treatments? (e) Identify the experimental units (f) Draw a diagram similar to Figure 7,8, or 10 to illustrate theExplanation / Answer
Answer:
(a)
In this experiment type of experimental design is true experimental design.
(b)
Result of this experiment was aplied to 14 individuals.
(C)
Response variable in this experiment was quantitative.
(D)
One group was placed into dieting.
(E)
Experimental units were:
Kilojoules per day (kJ/day) for energy consumption.
Volume was detected in percentage.
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