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The torque, T Nm , required to rotate shafts of different diameters

The torque, T Nm , required to rotate shafts of different diameters,
D mm, on a machine has been tested and recorded as below.
D (mm) 6 10 14 18 21 25
T (mm) 5.5 7 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.
c) Estimate the value of torque required when the diameter is 16 mm.
d) Calculate the coefficient of correlation between these variables and comment on your prediction obtained in (c)

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