1. Moisture content in percent by volume (x ) and con- ductivity in mS/m (y) were measured for 50 soil specimens. The means and standard deviations were x = 8.1, sx = 1.2, y = 30.4, sy = 1.9. The correlation between conductivity and moisture was computed to be r = 0.85. Find the equation of the least-squares line for predicting soil conductivity from moisture content.

2. During times in days (x ) and compressive strengths in MPa (y) were recorded for several concrete speci- mens. The means and standard deviations of the x and y values were x = 5, sx = 2, y = 1350, sy = 100. The correlation between curing time and compressive strength was computed to be r = 0.7. Find the equation of the least-squares line to predict compressive strength from curing time.