2013 AP Statistics統計學真題Practice Exam系列之簡答題免費下載

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2013 AP Statistics Practice Exam Free-Response Questions Free Download

2013 AP統計學模考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

完整版下載鏈接見文末

部分真題預覽：

Part A： 1）A hospital administrator noticed that the first nonemergency surgery scheduled each day often started late. If the first scheduled surgery got delayed, then all of the other surgeries scheduled for that day also got delayed. For three weeks (a total of 15 days) the administrator recorded how many minutes past the scheduled time the first surgery began each weekday. The data are shown in the table below. The administrator sent a memo to the hospital’s entire surgical staff to ask that everyone work to reduce the delay in the starting time for the first nonemergency surgery each day.

The administrator recorded how many minutes past the scheduled starting time the first scheduled surgery began each weekday for the three weeks after the memo was sent out. The data are shown in the table below. A negative number in the table indicates that the surgery started earlier than the scheduled time. The dotplots below display the distributions of minutes past the scheduled starting time before the memo went out and after the memo went out.

1. Based only on the dotplots, does it appear that the distribution of minutes past the scheduled starting time changed after the memo was sent? Explain.
2. The hospital administrator wants to perform a two-sample t-test to determine whether the average number of minutes past the scheduled starting time changed after the memo was sent. State the conditions for that test. For each condition, comment on whether it appears to be met.

Part B： 6）A drug company currently sells a prescription pain reliever that has been shown to be effective at lowering arthritis pain. However, since the drug also causes stomach irritation in some patients, the company has created a new formulation that it hopes will reduce that side effect.

To see if the new formulation reduces the occurrence of stomach irritation for users of the pain reliever, the company conducted a small preliminary study to compare the new formulation with the current pain reliever. In the preliminary study of 100 subjects with arthritis, 50 were randomly assigned to take the current pain reliever and 50 were randomly assigned to take the new formulation.
Patient responses at the end of the study are summarized in the table below.

1. Do the data from the preliminary study indicate, at the 10 percent level of significance, that the new formulation helps to reduce the proportion of patients with stomach irritation compared to the current pain reliever? (The conditions for inference have been checked and verified.)
   If you need more room for your work for part (a), use the space below.
2. Based on your conclusion in part (a), which type of error, Type I or Type II, is possible? Describe the consequences of each error in the context of this study.

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