### Question:
BivariateDataStatisticsCalculator { public double standardErrorForGradient() { return Math.sqrt(meanSquaredError() / secondMomentOf(xData)); } BivariateDataStatisticsCalculator(DoubleTensor xData, DoubleTensor yData); long size(); double xMean(); double yMean(); double estimatedGradient(); double estimatedIntercept(); double meanSquaredError(); double standardErrorForGradient(); double standardErrorForIntercept();  }### Answer:
@Test public void youCanGetTheStandardErrorForTheGradient() { assertThat(stats.standardErrorForGradient(), greaterThan(0.)); }