"Since the t-distribution is like the standard normal distribution but with a higher variance (smaller peak and fatter tails), this would seem to suggest that the sample standard deviation s systematically underestimates the population standard deviation, making it in fact a biased estimator."
"A t-distribution is like a Z distribution, except has slightly fatter tails to reflect the uncertainty added by estimating "
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.