2015 AP Statistics統(tǒng)計(jì)學(xué)真題Practice Exam系列之簡(jiǎn)答題免費(fèi)下載

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2015 AP Statistics Practice Exam Free-Response Questions Free Download

2015 AP統(tǒng)計(jì)學(xué)模考簡(jiǎn)答題部分免費(fèi)下載

此套題僅Section II含有簡(jiǎn)答題

共計(jì)1小時(shí)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(shí)1小時(shí)05分鐘，共5題，占Section II總分75%

Part B建議用時(shí)25分鐘，共1題，占Section II總分25%

可以使用圖形計(jì)算器

考試時(shí)會(huì)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）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.