2.26 Ore Samples A geologist collected 20 different ore samples, all the same weight, and randomly divided them into two groups. She measured the titanium (Ti) content of the samples using two different methods.

a. Construct stem and leaf plots for the two data sets. Visually compare their centres and their ranges.

b. Calculate the sample means and standard deviations for the two sets. Do the calculated values confirm your visual conclusions from part a?

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Method 1 0.011 0.013 0.013 0.015 0.014 0.013 0.010 0.013 0.011 0.012 Method 2 0.011 0.016 0.013 0.012 0.015 0.012 0.017 0.013 0.014 0.015