question: public double [ ] [ ] predictIntervals ( double conf ) { updateMeanAndVariance ( ) ; double val = Statistics . normalInverse ( 1.0 - ( 1.0 - conf ) / 2.0 ) ; double [ ] [ ] arr = new double [ 1 ] [ 2 ] ; arr [ 0 ] [ 1 ] = m_Mean + val * Math . sqrt ( m_Variance ) ; arr [ 0 ] [ 0 ] = m_Mean - val * Math . sqrt ( m_Variance ) ; return arr ; }
target:  Returns the interval for the given confidence value. 