This Saturday is Leap Day, so some lucky 39-year-olds on the verge of 40 get to say they're only 10! What's the easiest way to determine the probability of being born on a certain day, like February 29? It's to assume every day of the year has an equal probability of being a birthday. But ... no surprise here ... the numbers actually disagree!
Although a polar vortex hit most of the northern United States last week, thousands of visitors did converge on Punxsutawney, Pennsylvania to see if Punxsutawney Phil would see his shadow. Let’s look at a 2-sample t-test to see if Phil can be Punxsutawney’s chief advisor on how quickly winter ends.