# 1.1 Data - Tunghai University

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Note: ordinary arithmetic operations are meaningful only with quantitative data and are not meaningful with qualitative data. (III) Cross-Sectional and Time Series Data: Cross-sectional data: data collected at the same or approximately the same point in time.

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Note: ordinary arithmetic operations are meaningful only with quantitative data and are not meaningful with qualitative data. (III) Cross-Sectional and Time Series Data: Cross-sectional data: data collected at the same or approximately the same point in time.
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