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water · 2021年10月30日

老师 麻烦翻译下本题及解析，谢谢

  1. CFA I
  2. Quantitative

NO.PZ2021061603000013

问题如下：

The following is a frequency polygon of monthly exchange rate changes in the US dollar/Japanese yen spot exchange rate for a four-year period. A positive change represents yen appreciation (the yen buys more dollars), and a negative change represents yen depreciation (the yen buys fewer dollars).


Based on the chart, yen appreciation:

选项：

A.occurred more than 50% of the time B.was less frequent than yen depreciation C.in the 0.0 to 2.0 interval occurred 20% of the time

解释：

A is correct. Twenty observations lie in the interval "0.0 to 2.0"and six observations lie in the "2.0 to 4.0"interval. Together, they represent 26/48, or 54.17%, of all observations, which is more than 50%.

老师 麻烦翻译下本题及解析，谢谢

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4 个答案

星星_品职助教 · 2022年05月26日

@ 🍀SZJ🍀

同学你好，提问有些模糊，需要具体描述一下是哪里不明白。

🍀SZJ🍀 · 2022年05月26日

区间哪里看出来的。。。

星星_品职助教 · 2021年11月18日

@ 施敏

没错呀，觉得哪里有问题？

星星_品职助教 · 2021年10月31日

同学你好，

题干大意为：图像描述的是连续四年的美元/日元汇率的月度汇率变化（这句话说明一共有48个月），其中positive change（下有解释）就代表日元升值；negative change就代表日元贬值

题目问：根据图表中日元升值的情况，可以得到什么结论。

-----

本题图表纵轴是发生的频次（Frequency）。横轴是return区间的中位数。比如最右的横坐标是3.0%，就说明对应的区间是2%-4%的。同理，1.0%的横坐标对应的区间是0%-2%。

题干中说明positive change代表日元升值。positive change就是横轴的return大于0%的情况，即右边横轴显示为1和3的两段。这两段就对应着从0%到4%。其中1.0%的那段对应的纵轴频率是20，即发生了20次；3%那段对应的频率是6。所以positive change（日元升值）发生的总次数是20+6=26次。

同样的思路可以得到negative change（日元贬值）发生次数是22次。也可以通过January 2010到December 2013一共是48个月（一共发生了48次）来得出negative change的发生次数是48-26=22次。

由此可知，日元升值的次数占总次数的比例为26/48=54.17%，超过了50%，A选项描述正确。

同时，日元的升值次数（26次）＞日元贬值次数（22次），B选项描述错误。“0.0 to 2.0 interval”对应的frequency是20次，但占比20/48=41.67%，不是20% of the time。C选项错误。

施敏 · 2021年11月18日

老师，图片是不是放错了？你的答案跟图片对不上~

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