Join Eddie Davila for an in-depth discussion in this video Bell-shaped curve, part of Statistics Foundations: Probability.
- Three teachers, each has a class of 20 students, … each gives an exam. … How did these three classes do on an exam? … In class number one, quite a few students … scored 90 or above and not too many scored below 80. … The histogram is skewed to the right, … or negatively skewed. … Class number two skews to the left, or positively. … Most of the exam scores are below 80%. … And when we look at class number three, … the distribution is all over the place, … some high scores, some low scores, some in between. … It's hard to find a pattern in class number three. … Interestingly, many things do follow a pattern. … In the case of heights of people, … or national standardized test scores, even health data, … often we find that data follows a pattern. … Data will take on this bell shape … for its probability distribution. … When we see a bell-shaped curve, … what exactly are we looking at? … First, the mean of the data is centered … at the highest point of the curve. … Second, we'll notice that the data …
Eddie explains that probability is used to make decisions about future outcomes and to understand past outcomes. He covers permutations, combinations, and percentiles, and goes into how to describe and calculate them. Eddie introduces multiple event probabilities and discusses when to add and subtract probabilities. He describes probability trees, Bayes’ Theorem, binomials, and so much more. You can learn to understand your data, prove theories, and save valuable resources—all by understanding the numbers.