新SAT官方Daily Practice每日一题数学推理题

A restaurant chain with 8 locations wants to introduce healthier options to its menu. In order to determine customer preferences, the chain will offer three new healthy options for a two-week period at all of it's locations and analyze the percent of total orders that include at least one of the new healthy options. Which of the following research designs is most likely to produce valid results?

A.Recording how many customers ordered each of the new options at all of the restaurants over the two-week period

B.Asking a random sample of customers at all of the restaurants which new item they might order in the future

C.Recording how many customers ordered each of the new options at one of the restaurants over the two-week period

D.Recording how many customers ordered each of the new options for breakfast at all of the restaurants over the two-week period

8月SAT数学官方Daily Practice 每日一练，点击

重点单词：

determine [di'tə:min]v. 决定，决心，确定，测定

produce [prə'dju:s]n. 产品，农作物vt. 生产，提出，引起，

multiple ['mʌltipl]adj. 许多，多种多样的n. 倍数，并联

representative [repri'zentətiv]adj. 代表性的，代议制的，典型的n. 代

option ['ɔpʃən]n. 选择权，可选物，优先购买权v. 给予选

recording [ri'kɔ:diŋ]n. 录音 动词record的现在分词

appropriate [ə'prəupriət]adj. 适当的，相称的vt. 拨出(款项)

sample ['sæmpl]n. 样品，样本vt. 采样，取样

random ['rændəm]adj. 随机的，随意的，任意的

答案：A

解析：

Choice A is correct. Asking customers which new option they might order in the future does not determine actual customer preferences. One restaurant may not be representative of the entire chain. Some of the new options may be more appropriate for lunch or dinner. Therefore, the following are less likely to produce valid results:

Asking a random sample of customers at all of the restaurants which new option they might order in the future.

Recording how many customers ordered each of the new options in one of the restaurants over the two-week period.

Recording how many customers ordered each of the new options for breakfast in all of the restaurants over the two-week period.