This is a statistic class that accepts one or two unidimensional arrays of data. It returns a stat array using the getStats() method. If only one array is sent, it will return
the min,max, sum, median, average and standard deviation for this array. If two arrays are sent, in addition to these values for both arrays, a linear regression line is
computed with its correlation r and 't'test. Median correction applied on 02/26/01.