搜搜考试网求高人解答一道AP统计题
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求高人解答一道AP统计题
15.Based on a random sample of 50 students,the 90 percent confidence interval for the mean amount of money students spend on a lunch at a certain high school is found to be ($3.45,$4.15).which of the following statements is true?
A.90% of all random samples of 50 students obtained at this high school would result in a sample mean amount of money students spend on lunch between $3.45 and $4.15.
B.90% of all random samples of 50 students obtained at this high school would result in a 90% confidence interval that contains the true mean amount of money students spend on lunch.
15.Based on a random sample of 50 students,the 90 percent confidence interval for the mean amount of money students spend on a lunch at a certain high school is found to be ($3.45,$4.15).which of the following statements is true?
A.90% of all random samples of 50 students obtained at this high school would result in a sample mean amount of money students spend on lunch between $3.45 and $4.15.
B.90% of all random samples of 50 students obtained at this high school would result in a 90% confidence interval that contains the true mean amount of money students spend on lunch.
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
再问： B有两个90%了，你不觉得重复了吗？
再问： B有两个90%了，你不觉得重复了吗？