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A major change in attitudes toward prisons during the 1830s was the idea that prisoners could not be rehabilitated.
Margin of Error
An expression of the amount of random sampling error in a survey's results, indicating a confidence range within which the true value lies.
Sampling Error
The difference between a sample statistic and the corresponding population parameter, arising due to the fact that the sample is not a perfect representation of the population.
Biased Estimator
An estimator that, on average, does not equal the true parameter of the population, indicating a systematic error in estimation.
Population Parameter
A numerical value summarizing a characteristic of an entire population, such as mean or variance.
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