Unformatted text preview: You may work in groups, pairs, or as individuals for this assignment. Each person is responsible for submitting their own
work. This worksheet is worth 20 points.
Have a Nice Trip (Page 241 of your book)
An area of research in biomechanics and gerontology concerns falls and fall-related injuries, especially for elderly
people. Recent studies have focused on how individuals respond to large postural disturbances (e.g., tripping, induced
slips). One question is whether subjects can be instructed to improve their recovery from such disturbances.
Suppose researchers want to compare two such recovery strategies, lowering (quickly stepping down with front leg and
then raising back leg over the object) and elevating (lifting front leg over the object). Subjects will have first been trained
on one of these two recovery strategies, and they will be asked to apply it after they feel themselves tripping. The
researchers will then induce the subject to trip while walking (but harnessed for safety) using a concealed mechanical
Suppose the following 24 subjects have agreed to participate in the study:
Alisha, Alice, Betty, Martha, Audrey, Mary, Barbie, Anna
Matt, Peter, Shawn, Brad, Michael, Kyle, Russ, Patrick, Bob, Kevin, Mitch, Marvin, Paul,
Pedro, Roger, Sam
1. One way to design this study would be to assign the 8 females to use the elevating strategy and the 16 males to
use the lowering strategy. Would this be a reasonable strategy? Explain why not.
No, it would not be a reasonable strategy, it isn't evenly
distributed as the sex could be a variable that could affect
2. One way to deal with this issue is to assign 4 females and 8 males to each group. Now, if you saw a difference in
the proportion of trips in the two groups, could it be because of the sex of the subject? Why or why not? Could
it be due to other variables, distinct from the recovery strategy? Why or why not?
No, because it is evenly distributed- same number of males
and females in each group.
Yes, for example maybe the first group has an younger age
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- Spring '17