2011 AP Statistics統(tǒng)計學(xué)真題系列（Form B）之簡答題免費(fèi)下載

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2011 AP Statistics (Form B) Free-Response Questions Free Download

2011 AP統(tǒng)計學(xué)(Form B)簡答題部分免費(fèi)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(yù)覽：

Part A：

1）Records are kept by each state in the United States on the number of pupils enrolled in public schools and the number of teachers employed by public schools for each school year. From these records, the ratio of the number of pupils to the number of teachers (P-T ratio) can be calculated for each state. The histograms below show the P-T ratio for every state during the 2001–2002 school year. The histogram on the left displays the ratios for the 24 states that are west of the Mississippi River, and the histogram on the right displays the ratios for the 26 states that are east of the Mississippi River.

1. Describe how you would use the histograms to estimate the median P-T ratio for each group (west and east) of states. Then use this procedure to estimate the median of the west group and the median of the east group.
2. Write a few sentences comparing the distributions of P-T ratios for states in the two groups (west and east) during the 2001–2002 school year.
3. Using your answers in parts (a) and (b), explain how you think the mean P-T ratio during the 2001–2002 school year will compare for the two groups (west and east).

Part B：

6) Grass buffer strips are grassy areas that are planted between bodies of water and agricultural fields. These strips are designed to filter out sediment, organic material, nutrients, and chemicals carried in runoff water. The figure below shows a cross-sectional view of a grass buffer strip that has been planted along the side of a stream.

A study in Nebraska investigated the use of buffer strips of several widths between 5 feet and 15 feet. The study results indicated a linear relationship between the width of the grass strip (x), in feet, and the amount of nitrogen removed from the runoff water (y), in parts per hundred. The following model was estimated.

1. Interpret the slope of the regression line in the context of this question.
2. Would you be willing to use this model to predict the amount of nitrogen removed for grass buffer strips with widths between 0 feet and 30 feet? Explain why or why not.
   A scientist in California wants to know if there is a similar relationship in her area. To investigate this, she will place a grass buffer strip between a field and a nearby stream at each of eight different locations and measure the amount of nitrogen that the grass buffer strip removes, in parts per hundred, from runoff water at each location. Each of the eight locations can accommodate a buffer strip between 6 feet and 13 feet in width. The scientist wants to investigate which combination of widths will provide the best estimate of the slope of the regression line.

 

 

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2011 AP Statistics統(tǒng)計學(xué) (Form B) FRQ簡答題完整版答案免費(fèi)下載

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2011 AP Statistics Free-Response Questions Free Download

2011 AP統(tǒng)計學(xué)簡答題部分免費(fèi)下載

此套題僅Section II含有簡答題

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

下載方式請訪問下方鏈接

2011 AP Statistics FRQ真題

 

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