Can video games improve balance among the elderly? The article “The Effect of Virtual Reality Gaming on Dynamic Balance in Older Adults” (Age and Ageing 2012: 549– 552) reported an experiment in which 34 senior citizens were randomly assigned to one of two groups: (1) 16 who engaged in a six-week exercise regimen using the Wii Fit Balance Board (WBB) and (2) 18 who were told not to vary their daily physical activity during that interval. The accompanying data on improvement in 8-foot-up-and-go time (sec), a standard test of agility and balance, is consistent with information in the article. Test whether the true average improvement is greater using the WBB than under control conditions at the .05 significance level.

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WBB -1.9 -0.8 0.1 0.5 0.6 0.7 0.8 0.9 1.1 1.2 1.5 2.0 2.1 2.7 3.2 3.7 Control -2.6 -2.2 -2.1 -1.8 -1.4 -1.1 -0.7 -0.6 -0.3 -0.1 0.0 0.3 0.4 1.0 1.3 2.3 2.4 4.5