### Question:
NewValue { public double getVariance() { return ((numDataValues > 1) ? newS /(numDataValues - 1) : Double.NaN); }  void clear(); void push(double x); long getNumDataValues(); double getMean(); double getVariance(); double getStandardDeviation(); double getSum();  }### Answer:
@Test public void testGetVariance() { NewValue victim = new NewValue(); Double[] testValues = new Double[]{1.0, -1.0, 2.0, 2.1, 0.0, 53.0, -27.5}; for (double value : testValues) { victim.push(value); } double variance = getVariance(testValues); assertEquals("Calculated variance should match variance from test object.", variance, victim.getVariance(), EPSILON); assertEquals("Calculated standard deviation should match standard deviation from test object.", Math.sqrt(variance), victim.getStandardDeviation(), EPSILON); }