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Normal Probability Distribution
A symmetric, bell-shaped distribution that is characterized by its mean and standard deviation, representing the distribution of many types of data.
Rule of Thumb
A broadly applicable guideline or an easy generalization that is not necessarily very accurate but useful for making approximate judgments.
Cluster Sampling
A sampling method where the population is divided into clusters, and a random sample of these clusters is selected for study.
Probability Sampling
A sampling method where each member of the population has a known, non-zero probability of being selected in the sample.
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