汤姆说宠物主折射出家庭人口统计特征的钟形曲线(译注：正态分布曲线)。
Tom Gerds said pet owners mirror the bell curve of household demographics.
加权样本如果回复率相等，那么会提供有用信息的具有不同人口统计特征的个人。
The number of individuals in different demographic groups who would have provided usable information if response rates were equivalent. See sample weighting.
具有相似人口统计学特征的消费者之间存在实质性差异。
There are substantial differences among consumers with similar demographic characteristics.
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