2014北京大学统计学作业和答案（2014 statistics and assignments for Peking University）.docVIP

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2014北京大学统计学作业和答案（2014 statistics and assignments for Peking University）.doc

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2014北京大学统计学作业和答案（2014 statistics and assignments for Peking University）

2014北京大学统计学作业和答案（2014 statistics and assignments for Peking University） Job ID:51731 1. which of the following is a set of data is discrete (). (the first chapter (section sixth) to encourage work independently, punish plagiarism) The number of A. A. students B. B. the wages of workers C. gross domestic product C. D. D. stock price Answer: A A group of 2. numeric data, the maximum value is 121, the minimum value is 11, we are divided into 10 groups, group (distance) excuse me. (third: Third) A. A. 1.1 B. B. 11 C. C. 13.2 D. D. 15 Answer: B Three The number of parts of the 9 workers a day production were 15,17,19,20,20,22,22,22,23, the number is (). (the fourth chapter) A. A. 19 B. B. 20 C. C. 22 D. D. 22.5 Answer: C Four Which one of the following indicators reflect the trend of the (from). (Fourth: Second) A. A. quantile B. B. mean difference The median of C. C. D. D. means Answer: B 5.. The overall distribution of normal distribution N (1,9), from the overall extraction capacity of 1000 samples, the sample average expected value is equal to (). (the sixth chapter) A. A. 0 B. B. 1 C. C. 3 D. D. 9 Answer: B In the 6. parameter hypothesis testing, a (probability) is made. (the seventh chapter) A. A. first class error B. B. second types of errors C. C. third types of errors D. D. fourth types of errors Answer: A The standard of goodness of fit test of the regression model is (7.). (Tenth: Second) The A. A. coefficient of determination B. B. correlation coefficient C. C. covariance D. D. means Answer: A The fluctuation of the real economy in 8. between boom and bust, the circular economy belongs to (). (the eleventh chapter) A. A. long term trend B. B. cycle fluctuation C. C. seasonal fluctuation. D. D. does not rule change Answer: B In 9. random survey, in order to ensure the randomness, investigators often use, sampling method. (the second chapter) (to encourage work independently, punish plagiarism) Answer: simple random sampling; sampling; sampling type; cluster sa