第五章测试1.The smaller the Standard error of sample mean is, （ ）
A:the larger the variation of the observed individual B:the greater the reliability of estimating the population mean from the sample mean C:the greater the sampling error is D:the smaller the variation of the observed individual
答案:B
2.The cause of sampling error is （ ）
A:data are not normally distributed B:measurement is inaccurate C:sample is not randomly selected D:individual differences 3.According to the sample data, the 95% confidence interval of white blood cell count in healthy adults is
, which means （ ）A:The probability that this interval contains the sample mean is 95% B:It is estimated that 95% of the observations in the population are within this range C:The probability of the overall mean in this interval is 95% D:The probability that this interval contains the population mean is 95% 4.When sampling from a population of measurement data. If the sample size is increased, there will be （ ）
A:decrease in standard deviation B:increase of standard error C:decrease of standard error D:increase in standard deviation 5.In the same population, multiple random samples are used to estimate the 95% confidence interval of the population mean. The most reliable is （ ）
A:samples with small standard deviation B:samples with large standard error C:samples with small mean D:samples with small standard error
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