This is page fifteen of the series of free video lessons, "Statistics Lectures".
Statistics - Lecture 42
Parameters, Statistics, and Sampling Error
A characteristics that describes a population is called a parameter. Because it is often difficult (or impossible) to measure an entire population, parameters are most often estimated.
A characteristic that describes a sample is called a statistic.
Statistics are most often used to measure the value of unknown parameters.
Sampling error is any difference that exists between a statistic and its corresponding parameter.
Statistics - Lecture 43
Distribution of the Sample Mean
The Distribution of the Sample Mean is a probability distribution of all possible values of a sample mean, computed from a sample size n.
The standard deviation of the sampling distribution is also known as the Standard Error of the Mean.
Statistics - Lecture 44
The Central Limit Theorem
The Central Limit Theorem states that regardless of the shape of the population distribution, the distribution of the means will be approximately normal.
The distribution of the sample means will become more normal as its sample size increases.
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