2015 AP Statistics統(tǒng)計學真題系列之簡答題免費下載

歷年AP Statistics統(tǒng)計學系列

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2015 AP Statistics Free-Response Questions Free Download

2015 AP統(tǒng)計學簡答題部分免費下載

此套題共計1小時30分鐘，共6題

占總分50%

每道大題可能含有不同數(shù)量的小題

其中Part A建議用時1小時05分鐘，共5題，占Section II總分75%

Part B建議用時25分鐘，共1題，占Section II總分25%

可以使用圖形計算器

考試時會提供常用公式表

完整版下載鏈接見文末

部分真題預覽：

Part A： 1）Two large corporations, A and B, hire many new college graduates as accountants at entry-level positions. In 2009 the starting salary for an entry-level accountant position was $36,000 a year at both corporations. At each corporation, data were collected from 30 employees who were hired in 2009 as entry-level accountants and were still employed at the corporation five years later. The yearly salaries of the 60 employees in 2014 are summarized in the boxplots below.

1. Write a few sentences comparing the distributions of the yearly salaries at the two corporations.
2. Suppose both corporations offered you a job for $36,000 a year as an entry-level accountant.
   1. Based on the boxplots, give one reason why you might choose to accept the job at corporation A.
   2. Based on the boxplots, give one reason why you might choose to accept the job at corporation B.

Part B： 6)Corn tortillas are made at a large facility that produces 100,000 tortillas per day on each of its two production lines. The distribution of the diameters of the tortillas produced on production line A is approximately normal with mean 5.9 inches, and the distribution of the diameters of the tortillas produced on production line B is approximately normal with mean 6.1 inches. The figure below shows the distributions of diameters for the two production lines. The tortillas produced at the factory are advertised as having a diameter of 6 inches. For the purpose of quality control, a sample of 200 tortillas is selected and the diameters are measured. From the sample of 200 tortillas, the manager of the facility wants to estimate the mean diameter, in inches, of the 200,000 tortillas produced on a given day. Two sampling methods have been proposed.

• Method 1: Take a random sample of 200 tortillas from the 200,000 tortillas produced on a given day. Measure the diameter of each selected tortilla.
• Method 2: Randomly select one of the two production lines on a given day. Take a random sample of 200 tortillas from the 100,000 tortillas produced by the selected production line. Measure the diameter of each selected tortilla.

1. Will a sample obtained using Method 2 be representative of the population of all tortillas made that day,
   with respect to the diameters of the tortillas? Explain why or why not.

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