(Answered) The torque t nm required to rotate shafts of different

Statistics

The torque, T Nm, required to rotate shafts of different diameters, D mm, on a machine has been tested and recorded below.

D(mm) 6 10 14 18 21 25
T(Nm) 5.5 7.0 9.5 12.5 13.5 16.5

(a) Plot a scatter diagram of the results with diameter of the machine as the independent variable.

(b) Use the method of least squares to determine the linear regression equation that relates the torque to the diameter.

(d) Calculate the coefficient of correlation between these variables and comment on your prediction obtained in (c)

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