至于可靠性,大样本平均值对租车行、卖保修有意义,比较两辆单独的车的话方差远比平均值的差大几倍,所以选来选去也和掷骰子差不多。
至于可靠性,大样本平均值对租车行、卖保修有意义,比较两辆单独的车的话方差远比平均值的差大几倍,所以选来选去也和掷骰子差不多。
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