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wuzx · 2021年08月22日

是否只有石油行业一个自变量所以表格的数据不用看了?

NO.PZ2019040801000076

问题如下:

An analyst gathers the following data for a regression of the annual sales for Company Bridge, a maker of oil products, on oil product industry sales.

The regression was based on six observations and the correlation between company and industry sales is 0.9126.

Which of the following is closest to the value and is the most likely interpretation of the R^2 ? The R^2 is:

选项:

A.

0.1672, indicating that the variability of industry sales explains about 16.72% of the variability of company sales.

B.

0.1672, indicating that the variability of company sales explains about 16.72% of the variability of industry sales.

C.

0.8328, indicating that the variability of oil industry sales explains about 83.28% of the variability of company sales.

D.

0.8328, indicating that the variability of company sales explains about 83.28% of the variability of oil  industry sales.

解释:

C is correct.

考点:Linear Regression with One Regressor

解析:R^2 = 0.9126^2 =0.8328

自变量的变动可以解释R^2比例的因变量的变动。因此本题选C;答案D说反了。

表格里的数字有什么用处
1 个答案

品职答疑小助手雍 · 2021年08月22日

嗨,从没放弃的小努力你好:


表格里只是迷惑内容,对于本题计算R方没有用~

----------------------------------------------
虽然现在很辛苦,但努力过的感觉真的很好,加油!

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NO.PZ2019040801000076问题如下analyst gathers the following ta for a regression of the annusales for Company Brie, a maker of oil procts, on oil proinstry sales.The regression wbaseon six observations anthe correlation between company aninstry sales is 0.9126. Whiof the following is closest to the value anis the most likely interpretation of the R^2 ? The R^2 is:A.0.1672, incating ththe variability of instry sales explains about 16.72% of the variability of company sales.B.0.1672, incating ththe variability of company sales explains about 16.72% of the variability of instry sales.C.0.8328, incating ththe variability of oil instry sales explains about 83.28% of the variability of company sales.0.8328, incating ththe variability of company sales explains about 83.28% of the variability of oil instry sales.C is correct.考点LineRegression with One Regressor解析R^2 = 0.9126^2 =0.8328自变量的变动可以R^2比例的因变量的变动。因此本题选C;答案反了。怎么知道哪个是自变量哪个是因变量啊

2024-05-06 19:47 1 · 回答

NO.PZ2019040801000076问题如下analyst gathers the following ta for a regression of the annusales for Company Brie, a maker of oil procts, on oil proinstry sales.The regression wbaseon six observations anthe correlation between company aninstry sales is 0.9126. Whiof the following is closest to the value anis the most likely interpretation of the R^2 ? The R^2 is:A.0.1672, incating ththe variability of instry sales explains about 16.72% of the variability of company sales.B.0.1672, incating ththe variability of company sales explains about 16.72% of the variability of instry sales.C.0.8328, incating ththe variability of oil instry sales explains about 83.28% of the variability of company sales.0.8328, incating ththe variability of company sales explains about 83.28% of the variability of oil instry sales.C is correct.考点LineRegression with One Regressor解析R^2 = 0.9126^2 =0.8328自变量的变动可以R^2比例的因变量的变动。因此本题选C;答案反了。题目中 描述 The correlation between company sales aninstry=0.9**, 此处考察 multiple r = r^2 以及r^2 的。 multiple r 是 correlation between actuy forecast y. 感觉的题目描述有问题

2024-04-09 08:41 2 · 回答

0.9126是什么?怎么求出来的?

2019-11-06 23:20 1 · 回答

     老师你好,请问这道题的因变量和自变量是怎么判断的?谢谢

2019-08-11 19:19 1 · 回答