Dr.Len wants to determine whether or not dextrin causes people to lose weight.He gives 10 subjects dextrin and 10 subjects a placebo.He measures their weight every day (since weight seems to fluctuate daily)until the experiment is discontinued (after 4 weeks).In Dr.Len's study what are some disadvantages with using this particular design?
A)significant amount of variance in subjects occurs
B)carry-over effects
C)a large subject pool is needed
D)Both a & c
E)All of these

Question

Quizplus · Accepted Answer

The particular design used by Dr. Len has two disadvantages. First, since weight fluctuates daily, there is a significant amount of variance in subjects. Second, a large subject pool is needed to get statistically significant results. Moreover, there is also a risk of carry-over effects in the design if the dextrin or placebo from the previous period remains in the subject's system. Therefore, using this design has several limitations.

DrLen Wants to Determine Whether or Not Dextrin Causes People