Visual and musculoskeletal problems associated with the use of visual display terminals (VDTs) have become rather common in recent years. Some researchers have focused on vertical gaze direction as a source of eye strain and irritation. This direction is known to be closely related to ocular surface area (OSA), so a method of measuring OSA is needed. The accompanying representative data on y = OSA (cm²) and x = width of the palprebal fissure (i.e., the horizontal width of the eye opening, in cm) is from the article “Analysis of Ocular Surface Area for Comfortable VDT Workstation Layout” (Ergonomics 1996: 877–884).

a. Construct a scatterplot of this data. Describe what you find.
b. Calculate the equation of the LSRL.
c. Interpret the slope of the LSRL.
d. What OSA would you predict for a subject whose palprebal fissure width is 1.25 cm?
e. What would be the estimate of expected OSA for people with palprebal fissure width of 1.25 cm?

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X y X y X y X y .40 1.02 .75 1.74 1.15 3.18 .42 .48 1.21 .88 .78 1.63 1.20 3.76 .84 2.00 .51 .57 .60 .70 .75 .98 1.52 1.83 1.50 1.80 .95 .99 2.80 2.48 1.25 1.25 1.28 3.68 3.82 3.21 1.03 2.47 1.40 1.43 3.75 4.10 4.18 3.77 1.46 1.49 1.55 1.58 4.34 4.21 1.12 3.05 1.30 1.34 1.37 4.27 3.12 3.99 1.60 4.92