Head/neck posture of seated office workers. Bad neck and shoulder posture in seated office workers can lead to upper-body musculoskeletal disorders. Consequently, techniques have been developed to quantify neck and upper extremity postures. Human Factors (November 2019) investigated the reliability of using wireless motion sensors to measure upper-body posture positions. The study included 31 full-time office workers seated for one hour at their desk or workstation. (None of the office workers had a history of upper-body musculoskeletal disorders.) One variable measured for each worker was the percentage of time the head or neck stayed in a neutral position. Summary statistics for the 31 workers are shown in the table. Suppose the researchers hope to use this information to establish a baseline mean for good head and neck posture. Would a baseline mean of 55% be possible for good head posture? Good neck posture? Explain. Sample Mean Sample Standard Deviation Head 48.97% 22.13% Neck 43.20% 21.41% Source: Jun, D. et al. “Are Measures of Postural Behavior Using Motion Sensors in Seated Office Workers Reliable?”, Human Factors, Vol. 61, No. 7, November 2019 (Table 1).