C-Rachel

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mayanfang1

答案和详解如下：

Q1. Monthly Gross Domestic Product (GDP) figures from 1990-2000 are an example of:

A)     cross-sectional data.

B)     systematic data.

C)     time-series data.

Correct answer is C)

A time-series is a group of observations taken at specific and equally spaced points in time. Cross-sectional data are observations taken at a single point in time.

Q2. The sample of per square foot sales for 100 U.S. retailers in December 2004 is an example of:

A)     unbiased data.

B)     cross-sectional data.

C)     time-series data.

Correct answer is B)

Cross-sectional data are a sample of observations taken at a single point in time. A time-series is a sample of observations taken at specific and equally spaced points in time.