Statistics How To

Statistics Definitions > Kelly’s Measure of Skewness What is Kelly’s Measure of Skewness? Kelly’s Measure of Skewness is one of several ways to measure skewness in a data distribution. Bowley’s skewness is based on the middle 50 percent of the observations in a data set. It leaves 25 percent of the observations in each tail … Read more

Skewness > Bowley Skewness What is Bowley Skewness? Bowley skewness is a way to figure out if you have a positively-skewed or negatively skewed distribution. One of the most popular ways to find skewness is the Pearson Mode Skewness formula. However, in order to use it you must know the mean, mode (or median) and … Read more

Statistics Definitions > Pearson Mode Skewness Pearson mode skewness, also called Pearson’s first coefficient of skewness, is a way to figure out the skewness of a distribution. The mean, mode and median can be used to figure out if you have a positively or negatively skewed distribution. If the mean is greater than the mode, … Read more

Statistics Blog > Statistics Made Easy If you want to pass your stats class, these tips will ensure that you get through your class. Statistics Made Easy Tip #1 Go to every class and do all the homework for the first month. Why the first month? About a quarter to half of all students drop … Read more

Statistics Blog > Misleading Statistics Examples In my previous post, I wrote about misleading graphs in real-life. Misleading statistics examples ranged from Fox News’ coverage of politics to The Times newspaper’s claim that it beat the competition with slightly distorted graphs about circulation. Graphs aren’t the only way to distort statistics. In fact, stats are … Read more

Blog > Cool Math Games The Top 10 Best Cool Math Games: Probability and Statistics You’re never too old to play a game if you’re learning stats. Take a break from your textbook and have fun with these games. I scoured the internet for the most fun games that actually teach you something about probability, … Read more

Probability and Statistics > Ti 83 for Statistics > Difference Between BinomPDF and BinomCDF Contents: Difference Between BinomPDF and BinomCDF BinomCDF Steps BinomPDF Steps Difference Between BinomPDF and BinomCDF: Overview BinomPDF and BinomCDF are both functions to evaluate binomial distributions on a TI graphing calculator. Both will give you probabilities for binomial distributions. The main … Read more

Probability and Statistics > Excel for Statistics > Two Sample z Test Excel 2013 Two Sample z Test Excel 2013: Overview A two sample z test in Excel compares the means of two sets of data to see if there’s a difference. You run a z test to test the null hypothesis. You use the … Read more

Excel for Statistics > Excel Regression analysis (Excel 2013) Excel 2013 Regression analysis Regression is a way to find out the “best fit” equation for a set of data. It can help with forecasting and modeling. The linear regression equation will enable you to duplicate the overall data, but it won’t tell you how closely … Read more

Microsoft Excel for Statistics > T Test in Excel How to do a T Test in Excel: Overview The t test is a way to tell if the difference between before and after results is significant or if those results could have happened by chance. For example, a drug manufacturer might test a new drug … Read more