A z-score is a standardized measure of a data point. It represent how many standard deviations a particular value is away from mean. By doing … Read More

Imagine that you’re faced with a machine with 10 binary switches. You want to know the probability that if you flip every switch, you’ll get … Read More

You’ve probably heard people say “correlation doesn’t imply causation.” That’s true, and it’s a useful phrase taught in stats classes, but it don’t tell us … Read More

Once you submit your answer, the z-score percentile calculator will tell you what your test result was in terms of percentile. That’s because we’re left … Read More

Imagine you’re in class after taking a challenging statistics exam. Your friend got a 78 and you got an 82. Did she do better? That … Read More

Three six-sided dice are just a number generator, right? That’s how you use them, but what they do is follow a statistical distribution that’s not … Read More

In gaming, there’s a familiar sound: the clatter of two dice bouncing off each other onto felt table. It mean luck is turning or changing, … Read More

How many distinct poker hand are there? What are my chances of hitting a jackpot in the lottery? These all seem like difficult problems initially. … Read More

Start with a few (three or five) variables whose relationships you suspect but don’t see directly. Your intuition is shown as a matrix of numbers … Read More

People fail to recognize that if they gets a correlation coefficient of 0.5, there must be a strong relationship between those two variable. Not so … Read More