复习统计(1)
2016-08-24 20:11
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parameter 参数 来自母体 例如母体均值μ, 母体标准差 σ
statistic 统计量 来自抽样 例如样本均值x⎯⎯, 样本标准差 s
The objective of statistics is to make inference about a population based on information contained in a sample.
central limit Theorem 中央极限定理
- n≥30, 不论母体之分布,
x¯∼N(μx¯=μ,σx¯=σn√)
- n<30, 母体为正态分布,
x¯∼N(μ,σn√)
- n≥30, 不论母体之分布,
p̂ ∼N(μp̂ =P,σp̂ =P(1−P)n)‾‾‾‾‾‾‾‾‾‾√
Two types of estimation are point estimation and interval estimation.
(1)Point Estimator (点估计): A point estimator of a population parameter is a rule (or formula) that tells you how to calculate a single number based on sample data. The resulting number is called a point estimate of the parameter.
μ:x⎯⎯ σ:s P:p̂
Unbiased estimator (不偏估计量): An estimator of a population parameter is said to be unbiased if the mean of its sampling distribution is equal to the parameter.
E(sample estimator)=population parameter
X⎯⎯⎯, S, and P̂ are unbiased estimator
(2)Interval Estimation (区间估计): an interval estimator of a
population parameter is a rule that tells you how to calculate two numbers based on sample data
Confidence coefficient (信赖系数): the probability that a confidence interval will enclose the estimated parameter is called the confidence coefficient.
信赖系数是小数值;信赖水准是百分值。
statistic 统计量 来自抽样 例如样本均值x⎯⎯, 样本标准差 s
The objective of statistics is to make inference about a population based on information contained in a sample.
central limit Theorem 中央极限定理
- n≥30, 不论母体之分布,
x¯∼N(μx¯=μ,σx¯=σn√)
- n<30, 母体为正态分布,
x¯∼N(μ,σn√)
- n≥30, 不论母体之分布,
p̂ ∼N(μp̂ =P,σp̂ =P(1−P)n)‾‾‾‾‾‾‾‾‾‾√
Two types of estimation are point estimation and interval estimation.
(1)Point Estimator (点估计): A point estimator of a population parameter is a rule (or formula) that tells you how to calculate a single number based on sample data. The resulting number is called a point estimate of the parameter.
μ:x⎯⎯ σ:s P:p̂
Unbiased estimator (不偏估计量): An estimator of a population parameter is said to be unbiased if the mean of its sampling distribution is equal to the parameter.
E(sample estimator)=population parameter
X⎯⎯⎯, S, and P̂ are unbiased estimator
(2)Interval Estimation (区间估计): an interval estimator of a
population parameter is a rule that tells you how to calculate two numbers based on sample data
Confidence coefficient (信赖系数): the probability that a confidence interval will enclose the estimated parameter is called the confidence coefficient.
信赖系数是小数值;信赖水准是百分值。
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