The specific resistance of some copper wire of nominal diameter 1mm is estimated by determining the resistance of 6 samples of the wire. The resistance values found are: Ohms per metre 2.16 2.14 2.17 2.15 2.16 2.18 a) Explain the term 'confidence interval' b) Determine the 95% confidence interval for the true specific resistance of the wire, explaining the process you are using to do this. c) Comment on the effect of values outside the limits