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Normal Distribution
A bell-shaped data distribution that is symmetric about the mean, representing a common pattern in which most occurrences take place near the average and fewer occur as you move away.
Two-tailed Test
A hypothesis test where the area of interest is in both tails of the probability distribution, allowing for investigating deviations in two opposite directions.
T Distribution
A probability distribution that arises when estimating the mean of a normally distributed population in situations where the sample size is small and population variance is unknown.
One-tailed Test
A statistical hypothesis test in which the region of rejection is on only one side of the sampling distribution, used when the research hypothesis predicts a direction of the effect.
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