chapter
Assignment 16
Pages 1

Determine the linear coefficient of correlation for this data. (18)

6. Some results obtained from a tensile test on a steel specimen are shown below:

Tensile force (kN) Extension (mm) 4.8 3.5 9.3 8.2

12.8 10.1 17.7 15.6 21.6 18.4 26.0 20.8

Assuming a linear relationship: (a) determine the equation of the regression line

of extension on force (b) determine the equation of the regression line

of force on extension (c) estimate (i) the value of extension when the

force is 16 kN, and (ii) the value of force when the extension is 17 mm. (24)