Refer to the Analytical Chemistry (May 2010) study in which medical researchers tested a new method of

Question:

Refer to the Analytical Chemistry (May 2010) study in which medical researchers tested a new method of typing blood using low-cost paper, Exercise 2.163 (p. 96). The researchers applied blood drops to the paper and recorded the rate of absorption (called blood wicking). The table gives the wicking lengths (millimeters) for six blood drops, each at a different antibody concentration. Let y = wicking length and x = antibody concentration.

Concentration Droplet Length (mm) 22.50 16.00 13.50 14.00 13.75 12.50 0.0 0.4 0.6 0.8 1.0

Based on Khan, M.S., et al. "Paper diagnostic for instant blood typing."
Analytical Chemistry, Vol. 82, No. 10, May 2010 (Figure 4b).
a. Give the equation of the straight-line model relating y to x.
b. An SPSS printout of the simple linear regression analysis is shown below. Give the equation of the least squares line.
c. Give practical interpretations (if possible) of the estimated y-intercept and slope of the line.