Question: You conduct a well-designed study involving a random sample. Your analysis shows this sample is normally distributed and representative of the population; however, the mean

You conduct a well-designed study involving a random sample. Your analysis shows this sample is normally distributed and representative of the population; however, the mean age in the sample is 29.4 years, and the mean age in the population is 30 years. What is this type of difference called, and what is the likely cause of the difference? Should the researcher be concerned?

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