Discussion
Which of the following is a parameter ?
Answer: B
A parameter is the population mean.
In statistics a parameter is a numerical measure that describes a characteristic of the population, such as the population mean (μ), standard deviation (σ) or proportion. Its counterpart computed from a sample is called a statistic and is used to estimate the parameter.
The sample mean is therefore a statistic, not a parameter. The size of the sample is chosen by the investigator, and the size of the population is a count of units rather than a measure describing the distribution of the characteristic studied, so neither is the parameter the question means.
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