class MoreMath::Sequence

def t_welch(other)

instance and the +other+.
Returns the t value of the Welch's t-test between this Sequence 
def t_welch(other)
  signal = arithmetic_mean - other.arithmetic_mean
  noise = Math.sqrt(sample_variance / size +
    other.sample_variance / other.size)
  signal / noise
rescue Errno::EDOM
  0.0
end