A researcher measures the average number of depressive symptoms in a group of 50 adults diagnosed with clinical depression. This calculated average is referred to as a ____.

In psychological research, investigators calculate statistics from a specific group to estimate corresponding values in a larger group. For instance, if a researcher studies $$50$$ adults with clinical depression and calculates their average number of depressive symptoms, this calculated average is a sample statistic. The researcher then uses this statistic to draw conclusions about the corresponding population parameter, which is the true average number of depressive symptoms for all adults living with clinical depression.

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A population parameter is a numerical value representing a specific characteristic of an entire population, such as the true mean or correlation. Because researchers typically cannot measure every individual within a population, they must rely on sample statistics to estimate these corresponding population-level values.

Population Parameter

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KPU Research Methods in Psychology - 4th American Edition

Sampling error refers to the natural, random variability that occurs in a statistic from one sample to another, even when all samples are randomly drawn from the same population. This random variability means that a sample statistic is rarely a perfect estimate of its corresponding population parameter, and it does not imply that a mistake was made during the research process.

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