Time spent standing or walking. A study was undertaken to compare daily activity levels in lean (group 1) and obese (group 2) study subjects. Sensors monitored the type and amount of routine daily activities such as walking, sitting, and lying down in each subject.

Data are shown in Table 12.15. Students are also encouraged to download LEVINE2005.* from the companion website. We wish to compare time spent standing or walking (column 4) in lean and obese study subjects. Provide summary statistics and test whether the means differ significantly.