2015 AP Statistics统计学真题Practice Exam系列之简答题免费下载

历年AP Statistics统计学系列

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2015 AP Statistics Practice Exam Free-Response Questions Free Download

2015 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）A university researcher is interested in comparing the percents of high school seniors who took a college entrance exam for two different regions of the country, Region I and Region II. The researcher recorded the percent of seniors taking the exam for each high school within the two regions. The boxplots of the distributions of the percents of seniors who took the college entrance exam are shown below.

1. Compare the distributions of percents of seniors who took the college entrance exam for the two regions.
2. In writing a report, the researcher produced a single histogram of the combined data for Region I and Region II. Describe the shape of the histogram for the combined data.

Part B： 6）A consumer group compared the longevity of two types of razor blades: an inexpensive generic blade and a more expensive name-brand blade. Two independent samples were randomly selected—one consisted of ten generic blades and the other consisted of ten name-brand blades. The number of shaves obtained before a blade became too dull to provide a close shave was recorded for each blade in the two independent samples.

Number of Close Shaves for the Generic (G) Type
99  111  97  101  118  108  96  129  80  136
Number of Close Shaves for the Name-brand (B) Type
112  105  109  122  130  113  106  116  103  110

1. Create a back-to-back stemplot to display the distributions of the data.
2. In a few sentences, compare the distributions in part (a).
3. To test whether the name-brand blades tend to last longer than the generic blades on average, a two-sample t-test was performed. The conditions for inference were checked and verified. The test statistic was t = 0.87, with a p-value of 0.20. What should be concluded about whether the name-brand blades last significantly longer than the generic blades? Explain.