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(i) The t-distribution, also called Student's t-distribution, is a probability distribution that arises when estimating the mean of a normally distributed population in situations where the sample size is small and the population standard deviation is unknown. It is symmetric and bell-shaped, similar to the standard normal distribution, but has heavier tails, which accounts for the extra variability introduced by estimating ____ ________ _________ _______ ______ _____ __________ _____.
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