STANDARD S.ID.A.2
AI

Use statistics appropriate to the shape of the data distribution to compare center (median, mean) and spread (interquartile range, sample standard deviation) of two or more different data sets.
Values in the given data sets will represent samples of larger populations. The calculation of standard deviation will be based on the sample standard deviation formula s=√(Σ(x-x)2 /(n-1)).  The sample standard deviation calculation will be used to make a statement about the population standard deviation from which the sample was drawn.