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A statistic is a calculation based on sample data that estimates a population parameter.
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In a statistical study, the population is the total group of interest that we hope to understand by taking a sample (smaller group) from it.
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In observational research a researcher is "invisible" to the participants. They do not influence or provide treatments, advertisements, sample products, etc. that would change a participants normal behavior or decisions.
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Convenience sampling is the preferred sampling method for all research because it does not introduce bias into the study.
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Three measures of Central Tendency are variance, range and percentile rank.
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