Answer:(B) for Confidence interval is refers to the structure by the sample statistics estimates of population parameters of interval.In statistics,a confidence interval is the probability sample interval estimate of a population parameter.It shows the real value of this parameter has a certain probability to fall around the measurement results.Given confidence interval is a credible degree of the measured value of the measured parameters,namely in front of the required "probability".The probability is called the confidence level
求高人解答一道AP统计题15.Based on a random sample of 50 students,the 9
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