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2008 AP Statistics Practice Exam Free-Response Questions Free Download

2008 AP統計學?？己喆痤}部分免費下載

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

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部分真題預覽：

Part A：

1）Caffeine, a chemical found in many popular beverages, is known for reducing fatigue. A student wanted to investigate the caffeine content in popular beverages, such as soft drinks, energy drinks, tea, and coffee. The following data collected by the student show the amounts of caffeine (in milligrams per 12-ounce serving) for twelve popular beverages.

72? ? 55? ? 34? ? 45? ? 38? ? 70? ?7.5? ?165? ? 80? ?105? ?40? ?35

1. Construct an appropriate graphical display of the amounts of caffeine found in the twelve beverages.
2. Use the graph in part (a) to write a few sentences describing the distribution of caffeine content for the twelve beverages.
3. A 12-ounce cup of one popular gourmet coffee contains over 300 milligrams of caffeine. If this value was added to the data set of twelve numbers above, how would the mean and median of the data set above compare with the mean and median of the new data set with the thirteen numbers? Explain how this comparison could be made without performing any computations.

Part B：

6）An engineer is developing a polymer material and is concerned that the mean density, d, of the material is not sufficiently close to the desired target value of 1.37 kilograms per milliliter (kg/mL). Nine different samples of the material were prepared. The volumes, in milliliters, for the samples were 10, 20, 30, 40, 50, 60, 70, 80 and 90. The engineer carefully measured the mass (in kilograms) of each sample. For the range of volumes, the true density, d, (in kg/mL) of the material can be estimated by the slope of the least-squares regression line fit to the resulting data. (Recall that density is defined as mass divided by volume.) Computer output for the regression analysis is shown below.

1. Since the process the engineer used to measure the mass of samples does not always provide the true density value, the regression model shown above contains a random error term. To use the t-distribution to perform a test of hypotheses or construct a confidence interval for the slope of the least-squares regression line, the random errors must conform to some model assumptions. These include the assumption that the random errors are independent of each other. In the context of this experiment, this means that the error that
   the engineer makes in measuring the mass of one sample has no influence on the error made in determining the density of any other sample.
   Describe two other assumptions about the distribution of the random errors that are needed to use the t-distribution to perform a test of hypotheses or construct a confidence interval for the slope of the least squares regression line.
2. Assuming that all of the assumptions that you considered in part (a) are satisfied, construct a 95 percent confidence interval for d, the true density of the material. With respect to the target density of 1.37 kg/mL, what conclusion can be reached?
3. In context, what does the intercept in the least squares regression line that is associated with the computer output above represent?

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

完整版真題資料可以底部二維碼免費領取↓↓↓

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2008 AP Statistics (Form B) Free-Response Questions Free Download

2008 AP統計學（Form B）簡答題部分免費下載

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

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