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Imagine you are trying out a new way of teaching, splitting one half of the class up and teaching them one way while leaving the … Read More

Something feels different. Perhaps you suspect that your new manufacturing process is actualy faster. Or maybe the average test score in your class have changed … Read More

If you’ve taken most statistics classes, you’re familiar with determining p-values; not so much with the limits upon which their significance depend. Enter: the critical … Read More

Take as an example: A national poll say that a candidate is ahead by five percentage points, while the poll has a three percent margin … Read More

In nearly all planning situations there will be variability. With some reasonable ease we may calculate mean or average of whatever it is we are … Read More

Is there a difference between two groups? That’s the question that leads to decisions in public policy, marketing, and medicine. Does a new drug work … Read More

So you do a split test on your site: one page has a red button, another page has a green button. Your conversion rate was … Read More

If you’ve been around finance long enough, you’ll probably recall that your data should be “well behaved” according to the Bell Curve. But that’s not … Read More

The old saying goes that numbers like averages can be misleading, which isn’t entirely accurate. Averages is simply poor storytellers. They present you with a … Read More

The thing about outliers is you have nine values that appear completely typical, then there’s one that doesn’t even come close. Maybe that’s not an … Read More