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# Analytical methods for engineers - statistics and probability

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1. Can anyone help me with this question from start to finish I am having great difficulty with it. Any help would be greatly appreciated.

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.
(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).
2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

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Just quoting in Puddles the Monkey so she can move the thread if needed
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