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单选题 The width of a confidence interval estimate of the population mean widens when the
学科：商务统计学
时间：2023-05-08 23:16:46
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题目1判断题
The coefficient of variation measures variability in a data set relative to the size of the medianA. 对B. 错
题目2单选题
If a hypothesis is rejected at the 0.025 level of significance, itA. must be rejected at any levelB. must be rejected at the 0.01 levelC. must not be rejected at the 0.01 levelD. may be rejected or not rejected at the 0.01 level
题目3单选题
Which of the following p-values will lead us to reject the null hypothesis if the level of significance equals 0.05A. 0.15B. 0.10C. 0.05D. 0.025
题目4单选题
If you are testing a hypothesis that two population proportions are the same, you _______A. should calculate a 'pooled' value for the sample proportionB. should not calculate a 'pooled' value for the sample proportionC. use a sample proportion of zeroD. always use a 0.05 level of significance
题目5判断题
The coefficient of variation is a measure of relative dispersionA. 对B. 错
题目6单选题
The standardised residual is defined asA. residual divided by the standard error of estimateB. residual multiplied by the square root of the standard error of estimateC. residual divided by the square of the standard error of estimateD. residual multiplied by the standard error of estimate
题目7判断题
In developing a 90% confidence interval for the expected value of y from a simple linear regression problem involving a sample of size 15, the appropriate table value would be 1.761A. 对B. 错
题目8判断题
Statistical independence means the outcome of one event is independent of the outcome of a second eventA. 对B. 错
题目9判断题
The method of least squares requires that the sum of the squared deviations between actual y values in the scatter diagram and y values predicted by the regression line be maximisedA. 对B. 错
题目10单选题
The width of a confidence interval estimate of the population mean widens when theA. level of confidence increasesB. sample size decreasesC. value of the population standard deviation increasesD. All the options are correct
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