Statistics How To

Excel for Statistics > Standard Error Excel Standard Error Excel: Overview The standard error is really just another name for the standard deviation. In fact, where the standard deviation is a term used for a population, standard error is the term for a standard deviation for a sample. Standard deviation is a parameter, and standard … Read more

Excel for Statistics > ANOVA Excel 2013 (One-Way)   ANOVA Excel 2013 : Overview. With ANOVA (Analysis of Variance), you’re testing different groups to see if there’s a significant difference between them. For example, a manufacturer might have a new process to extend the shelf life of a product. You could use ANOVA to test … Read more

Statistics Definitions > Standardized Residuals Standardized residuals are very similar to the kind of standardization you perform earlier on in statistics with z-scores. Z-scores allow you to standardize normal distributions so that you can compare your values; standardized residuals normalize your data in regression analysis and chi square hypothesis testing. A standardized residual is a … Read more

Probability and Statistics > Probability > How to Draw a Venn Diagram Contents: Basic Diagram. Intersection: Draw a Venn Diagram of A ∩ B. Union: Draw a Venn Diagram for A ∪ B. Venn diagram template for Word. Venn diagrams are a way to visualize relationships between groups of objects. They are often confused with … Read more

Probability and Statistics > T-Distributions > Satterthwaite approximation Before you read this article, you may want to read this one first: Pooled standard error (how to find it). What is the Satterthwaite Approximation? The Satterthwaite approximation is a way to account for two different sample variances. Basically, there are two ways to account for two … Read more

Statistics Definitions > What is the Middle Fifty? The Middle fifty The middle fifty is another name for the interquartile range, which is a measure of spread in statistics. The middle fifty is useful for seeing where the bulk of the values in the data set lie, and how those values are clustered around the … Read more

Design of Experiments > Data Collection Methods Data Collection Methods: General Categories Data collection methods fall into four general categories: A census is a survey of a whole population. For example, the U.S. Census. Censuses can be very expensive and time-consuming, if the population is large. A sample survey takes a fraction of the population. … Read more

Statistics Basics > AP Statistics Formulas This is a list of all the AP Statistics Formulas you’re likely to encounter on the test. Your AP Statistics teacher should have given you a formula sheet to study but if you’ve lost it, you’ll be given one at the exam so there’s no need to memorize the … Read more

Probability and Statistics > Probability > Multiplication Rule Probability Multiplication rule probability (General) The multiplication rule is a way to find the probability of two events happening at the same time (this is also one of the AP Statistics formulas). There are two multiplication rules. The general multiplication rule formula is: P(A ∩ B) = … Read more

Probability and Statistics > Regression Analysis > Find a Regression slope intercept Regression Slope Intercept: Overview The regression slope intercept formula, b0 = y – b1 * x is really just an algebraic variation of the regression equation, y’ = b0 + b1x where “b0” is the y-intercept and b1x is the slope. Once you’ve … Read more