Category: Probability & Statistics

At an early age, you probably learned about the mean, median, and mode - favorite topics among standardized tests! Perhaps in high school you also learned about standard deviation and...

“What was the class average?” After a particularly difficult test, this is often a common question students and even parents sometimes ask. Another word for “average” is “mean,” in...

In Excel, normal distributions help us to find the probability that a variable falls within a given range of values.  The probability depends on the mean and standard deviation of the...

Finding the z score for a value in a data set helps us to see how many standard deviations that number is from the mean by “standardizing” the distribution so the mean is 0 and the standard...

Finding the percentile for a number in a data set helps us to get a sense of where the number falls in the distribution.  Microsoft Excel can find a given percentile for any set of values you...

Finding the quartiles for a set of numbers helps us to get a sense of how the data is spread out.  Microsoft Excel can find the quartiles (Q1, Q2, and Q3) for any set of values you choose as...