【单选题】【消耗次数:1】
描述一组正态或近似正态分布资料的平均水平用:
算术均数
几何均数
中位数
平均数
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相关题目
【判断题】 描述一组正态或近似正态分布资料的平均水平用均数。
①  正确
②  错误
【判断题】 描述偏态分布资料的平均水平用几何均数。
①  正确
②  错误
【单选题】 中位数等于几何均数的分布是:()。
①  负偏态分布
②  正态分布
③  对数正态分布
④  正偏态分布
⑤  以上都不是
【单选题】 描述一组偏态分布资料的平均水平,以下列哪个指标较好:
①  算术均数
②  几何均数
③  中位数
④  全距
【单选题】 描述正态或近似正态分布资料特征的是( )
①  中位数、四分位间距
②  均数、标准差
③  中位数、标准差
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【单选题】 描述一组对称分布资料变量值的平均水平,宜选用()。
①  算术均数
②  方差
③  几何均数
④  标准差
⑤  变异系数
【判断题】 根据分组资料计算算术平均数,当各组单位数出现的次数均相等时,其加权算术平均数计算的结果与简单算术平均数计算的结果相同。
①  正确
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【单选题】 当数值变量资料分布末端无确定数据时,平均数宜用:()。
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③  中位数
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⑤  四分位数
【单选题】 对于正偏态分布的总体,当样本含量足够大时,样本均数的分布近似为
①  正态分布
②  正偏态分布
③  负偏态分布
④  t分布
【单选题】 简单算术平均数作为加权算术平均数特例的条件是
①  各组权数相等
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随机题目
【单选题】 For many people today, reading is no longer relaxation. To keep up their work they must read letters, reports, trade publications, interoffice communications, not to mention newspapers and magazines: a never-ending flood of words. In getting a job or advancing in one, the ability to read and comprehend quickly can mean the difference between success and failure. Yet the unfortunate fact is that most of us are poor readers. Most of us develop poor reading habits at an early age, and never get over them. The main problem lies in language itself—words. Single words have little meaning until they are combined into phrases, sentences and paragraphs. Unfortunately, however, the untrained reader does not read groups of words. He reads one word at a time, often regressing to reread words or passages. Regression, or looking back over what you have just read, is a common bad habit in reading. Another habit which slows down the speed of reading is vocalization—sounding each word either orally or mentally as one reads. To overcome these bad habits, some reading clinics use a device called accelerator (加速器), which moves a bar down the page at a predetermined speed. The bar is set at a slightly faster rate than the reader finds comfortable, in order to “stretch” him. The accelerator forces the reader to read fast, making word-by-word reading, regression and vocalization virtually impossible. At first, comprehension is sacrificed for speed. But when you learn to read ideas, you will not only read faster, but your comprehension will improve. Many people have found their reading skills improved a lot after some training. Most people cant read and comprehend quickly mainly because __________.
①  they dont read groups of words
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【单选题】 Goats are being hired to do the work of people near San Diego. The fires that occurred in Hillborbough four years ago destroyed thirty homes, most of which have been rebuilt. While people were rebuilding the homes, the grasses and bushes were growing back. The area is now so overgrown in bushes that there is again a major danger of fire.The city government put up bids to remove the bushes. The lowest bid they received was $50,000—and that was if the city provided breakfast and lunch for the workers for the six weeks it would take to clear the overgrown area. The city only wanted to give unlimited coffee and a piece of bread a day for each person. When that offer was rejected, the city asked for help on its website.A sheepherder in Montanta and a goat-keeper in San Bernardino read about the city’s plight(困境)while surfing the Web. They both offered to do the job for $25,000. The city government chose the goat-keeper because he lived closer. When he was told that the city dump(垃圾场)was overflowing , the goat-keeper said, “No problem. My goats will eat everything in your dump, except the car engines, of course.” So, for another $5,000, the city killed two birds with one stone. If all goes well, they will invite the goat-keeper and his “family” back every three years. The goat-keeper said that he would probably visit San Diego while his goats were in the dump.According to the passage, __________.
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①  receive
②  make
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【单选题】 Client: Hello! May I speak to Mr. Turner?Secretary: ___________
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