private boolean isInBloom(StoreFileScanner scanner, byte[] row, BloomType bt, Random rand) {
    return isInBloom(scanner, row, RandomKeyValueUtil.randomRowOrQualifier(rand));
  }
Validates the false positive ratio by computing its z-value and comparing it to the provided
threshold.
@param falsePosRate   experimental positive rate
@param nTrials        the number of Bloom filter checks
@param zValueBoundary z-value boundary, positive for an upper bound and negative for a lower
                      bound
@param cbf            the compound Bloom filter we are using
@param additionalMsg  additional message to include in log output and assertion failures
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestCompoundBloomFilter.java