A newspaper poll reported that 73% of respondents liked...

A newspaper poll reported that 73$\%$ of respondents liked business tycoon Donald Trump. The number
73$\%$ is
(a) a population.
(b) a parameter.
(c) a sample.
(d) a statistic.
(e) an unbiased estimator.

Key Concepts

Unbiased Estimator

An unbiased estimator is a statistical method or rule that consistently produces estimates which, on average, are equal to the true population value of the parameter being estimated. This means the estimator does not systematically overestimate or underestimate the parameter.

Statistic

A statistic is a numerical measure computed from sample data, used to estimate or infer a corresponding population parameter. Since statistics are based on sample data, they serve as approximations of the true values in the population and reflect the sample's outcomes.

Population

A population is the complete set of individuals, items, or measurements that are of interest in a statistical study. It includes every member that fits a particular set of specifications in the study, and any characteristics derived from it are considered the complete picture of the phenomenon being analyzed.

Parameter

A parameter is a numerical summary or characteristic of a population, such as a mean, proportion, or standard deviation. It represents the true value that we wish to know about the entire population, but is often unknown because studying the whole population is usually impractical.

Sample

A sample is a subset of the population selected for analysis, with the intention of making inferences about the larger group. Samples are used because it is typically more feasible and cost-effective than examining every member of the population.

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