We think standard deviation is just a measure of how spread out a set of numbers are and we are only partially right. What’s tricky … Read More

The binomial distribution apply to binary decisions, in other words, any decision with exactly two options. That’s true of quality control checks, election polls, and … Read More

Suppose you’re looking at two lists of numbers. The first list represent hours studied for an exam; the second list contains your final grade on … Read More

So, how do I recruit? You want a specific answer with little means of getting it. How many response will be enough to produce valid … Read More

Binomial probability tells you whether you have a certain number of defects, and whether that is normal or a cause for concern. It works under … Read More

Uncertainty comes in form of confidence intervals: a range within which it’s likely that true number lies given our small amount of data. The plus … Read More

You have some numbers paired together (like ad spending vs. Revenue) or other things like time studied vs. It is a test score. And you … Read More

Do you recall being in school and having your math teacher give you a list of numbers? He’d put 10 scores on blackboard and demand … Read More

Ever been told you’re “in the top ten percent,” only to have no idea what that will do to your score? For some reason, percentiles … Read More

Imagine I give you a coin and ask you to hold it in your hand. You know it will land heads or tails, but you … Read More