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2008 AP Statistics Practice Exam Free-Response Questions Free Download

2008 AP统计学模考简答题部分免费下载

此套题仅Section II含有简答题

共计1小时30分钟，共6题

占总分50%

每道大题可能含有不同数量的小题

其中Part A建议用时1小时05分钟，共5题，占Section II总分75%

Part B建议用时25分钟，共1题，占Section II总分25%

可以使用图形计算器

考试时会提供常用公式表

完整版下载链接见文末

部分真题预览：

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?

此套题仅Section II含有简答题

共计1小时30分钟，共6题

占总分50%

每道大题可能含有不同数量的小题

其中Part A建议用时1小时05分钟，共5题，占Section II总分75%

Part B建议用时25分钟，共1题，占Section II总分25%

可以使用图形计算器

考试时会提供常用公式表

完整版真题资料可以底部二维码免费领取↓↓↓

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

2008 AP统计学（Form B）简答题部分免费下载

此套题仅Section II含有简答题

共计1小时30分钟，共6题

占总分50%

每道大题可能含有不同数量的小题

其中Part A建议用时1小时05分钟，共5题，占Section II总分75%

Part B建议用时25分钟，共1题，占Section II总分25%

可以使用图形计算器

考试时会提供常用公式表