Critical Knowledge (10 marks) Choosing what data to collect and how to measure it are the most significant part of any statistical analysis and errors made at the beginning can make your analysis meaningless. a) MJ has a ruler with cm graduations on one side and mm on the other. Discuss how many significant figures you can achieve when you measure the square sides if you use the cm side compared with the mm side, and what values the final decimal figure can be. I recommend you watch this video . Precision, Accuracy Measurement and Significant Figures video link b) Explain why you can use the average of a square's side lengths to determine the population mean of all the squares you made, but cannot use the average side lengths to determine standard deviation.