新SAT官方Daily Practise每日一题数学推理题

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SAT官方Daily Practice 数学汇总，点击进入

A potato chip company produces the same number of snack-sized bags of potato chips every month. A manager at the company randomly selects a sample of snack-sized bags of potato chips to be weighed in a routine quality-assurance check each month. The January sample had a mean weight of 0.95 ounces and a margin of error of 0.06 ounces. The February sample had a mean weight of 0.98 ounces and a margin of error of 0.04 ounces. Based on these findings, which of the following is an appropriate conclusion?

A.Most of the snack-sized bags of potato chips produced by the company in January each had a weight of at least 0.95 ounces, while most of the snack-sized bags of potato chips produced by the company in February each had a weight of at least 0.98 ounces.

B.The mean weight of all the snack-sized bags of potato chips produced by the company in January must have been 0.03 ounces more than the mean weight of all the snack-sized bags ofpotato chips produced by the company in February.

C.The mean weight of all the snack-sized bags of potato chips produced by the company in January was 0.03 ounces less than the mean weight of all the snack-sized bags of potato chipsproduced by the company in February.

D.The number of snack-sized bags of potato chips in the January sample was less than the number of snack-sized bags of potato chips in the February sample.

重点单词：

check [tʃek] n. 检查，支票，账单，制止，阻止物，检验标准

appropriate [ə'prəupriət] adj. 适当的，相称的

sample ['sæmpl] n. 样品，样本

insight ['insait] n. 洞察力

conclusion [kən'klu:ʒən] n. 结论

population [.pɔpju'leiʃən] n. 人口 ，(全体)居民，人数

routine [ru:'ti:n] n. 例行公事，常规，无聊

margin ['mɑ:dʒin] n. 差额，利润，页边空白，边缘

multiple ['mʌltipl] adj. 许多，多种多样的

randomly ['rændəmli] adv. 任意地，随便地，胡乱地

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