In fact, the first group were absolutely correct in their estimation of this man's height.事实上，第一组人对这名男子身高的估计完全正确。The first set of questions wasn't too bad, but they got really difficult after that.第一组问题不是太糟，但是后面的就非常难了。The second group of measurements had a high correlation with the first.第二组测量数据与第一组具有很强的相关性。