数据挖掘的目的是从______中找出有意义的模式。

B、最大值

C、端站值

D、中间

a．个人消费支出

b．私人国内总投资

c．政府购买

d．净出口

e．国防购买

f．州与地方政府购买

g．进口

你认为这些数据存在任何稳定的关系吗？你看出了什么趋势吗？(提示：寻找数据的一个好地方是《总统经济报告》(Economics Report of the President)的统计附录，该报告每年由总统经济顾问委员会撰写。此外，你也可以到www.bea.doc.gov去寻找，这是经济分析局(Bureau of Economics Analysis)的网站。)

Find data on GDP and its components, and compute the percentage of GDP for the following components for 1950, 1975, and 2000.

a．Personal consumption expenditures

b．Gross private domestic investment

c．Government purchases

d．Net exports

e．National defense purchases

f．State and local purchases

g．Imports

Do you see any stable relationships in the data？ Do you see any trends？ (Hint: A good place to look for data is the statistical appendices of the Economic Report of the President, which is written each year by the Council of Economic Advisers. Alternatively, you can go towww.bea.doc.gov,which is the Web site of the Bureau of Economic Analysis.)

此题为判断题(对，错)。