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Measurement error increases dispersion in your dataset as scores are less consistent. For example, your standard deviation of the arm length variable will be higher

Measurement error increases dispersion in your dataset as scores are less consistent. For example, your standard deviation of the arm length variable will be higher if you measure it with a lot of error from person to person.
How would increased measurment error affect your 95% confidence interval? Assume everything else about your sample stays the same.

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