How-To Guides
Step-by-step guides that teach you how to perform calculations manually.
How to Calculate the Trimmed Mean: Step-by-Step Guide
Calculate robust average by removing extremes
Read guideHow to Calculate Statistical Power: Step-by-Step Guide
Calculate statistical power manually
Read guideHow to Calculate Linear Regression: Step-by-Step Guide
Manual calculation of linear regression
Read guideHow to Calculate Interquartile Range (IQR): Step-by-Step Guide
Calculate IQR manually
Read guideHow to Calculate Weighted Average: Step-by-Step Guide
Calculate weighted mean manually
Read guideHow to Calculate the Harmonic Mean: A Step-by-Step Guide
Calculate harmonic mean manually
Read guideHow to Calculate Geometric Mean: Step-by-Step Guide
Learn to calculate geometric mean manually
Read guideHow to Calculate Poisson Distribution: Step-by-Step Guide
Calculate Poisson probabilities manually
Read guideHow to Calculate Pearson Correlation: Step-by-Step Guide
Calculate Pearson correlation manually
Read guideChi-Square Test: A Step-by-Step Guide
Learn to perform chi-square tests manually
Read guideHow to Calculate Binomial Distribution Probabilities: Step-by-Step Guide
Learn to manually calculate binomial distribution probabilities, mean, and variance. Understand the formula, worked examples, and common pitfalls.
Read guideHow to Calculate Normal Distribution Probabilities: Step-by-Step Guide
Learn to manually calculate normal distribution probabilities (P(X<x), P(X>x)) and Z-scores using mean, standard deviation, and a Z-table.
Read guideHow to Calculate Cohen's d: Step-by-Step Guide
Learn to manually calculate Cohen's d, a standardized measure of effect size. Understand the formula, prerequisites, and common pitfalls with a worked example.
Read guideHow to Calculate R-squared: Step-by-Step Guide
Learn to manually calculate R-squared (coefficient of determination) step-by-step. Understand the formula, variables, and interpret model fit.
Read guideHow to Calculate Spearman Correlation: Step-by-Step Guide
Learn to manually calculate Spearman's rank correlation coefficient (ρ) step-by-step. Understand the formula, handle ties, and interpret results for monotonic relationships.
Read guideHow to Calculate a Two-Sample Independent t-Test: Step-by-Step Guide
Learn to manually calculate a two-sample independent t-test. Covers formulas, assumptions, a worked example, and common pitfalls for engineers and STEM professionals.
Read guideHow to Calculate Your Weighted Grade: A Step-by-Step Manual Guide
Master manual weighted grade calculation. Learn the formula, identify components and weights, apply with a worked example, and avoid common errors.
Read guideHow to Manually Pick Random Names with Equal Probability: Step-by-Step Guide
Learn to manually pick names from a list with equal probability. Understand the formula, assign ranges, and use random numbers.
Read guideHow to Calculate Margin of Error: Step-by-Step Guide
Learn to manually calculate the margin of error for survey results. Understand the formula, Z-scores, and confidence intervals.
Read guideHow to Calculate Sample Size: Step-by-Step Guide
Learn to manually calculate sample size for surveys and experiments. Understand the formula, Z-scores, and finite population correction with a step-by-step example.
Read guideHow to Construct a Stem and Leaf Plot: Step-by-Step Guide
Learn to manually create stem and leaf plots for data visualization. Understand the formula, worked examples, common pitfalls, and when to use tools.
Read guideHow to Calculate Vote Percentage: Step-by-Step Guide
Learn to calculate vote percentage manually. This guide covers the formula, step-by-step instructions, a worked example, and common pitfalls for accurate election analysis.
Read guideHow to Calculate GPA: Step-by-Step Guide
Learn to manually calculate your Grade Point Average (GPA) with our step-by-step guide, formula, worked example, and common pitfalls.
Read guideHow to Calculate Coin Flip Probabilities and Track Results: Step-by-Step Guide
Learn to manually calculate and track coin flip probabilities over multiple trials, understand the formulas, and avoid common pitfalls.
Read guideHow to Calculate Z-Score: Step-by-Step Guide
Learn to manually calculate a Z-score using its formula. Understand prerequisites, follow a step-by-step example, and avoid common pitfalls.
Read guideHow to Generate Random Numbers Manually: Step-by-Step Guide
Learn to manually generate random numbers within a specified range, with or without repetition, using mathematical transformation.
Read guideHow to Calculate the Sum, Average, Count, Min, and Max of a List of Numbers: Step-by-Step Guide
Learn to manually calculate sum, average, count, minimum, and maximum for any list of numbers with formulas, examples, and common pitfalls.
Read guideHow to Calculate Descriptive Statistics: Step-by-Step Guide
Learn to manually calculate mean, median, mode, variance, standard deviation, and percentiles for any dataset. Includes formulas and a worked example.
Read guideHow to Calculate Variance: Step-by-Step Guide
Learn to calculate statistical variance by hand. This guide provides step-by-step instructions, formulas for population and sample variance, a worked example, and common pitfalls.
Read guideHow to Calculate Percentile Rank: Step-by-Step Guide
Learn to manually calculate the percentile rank of a data value within a dataset using a robust formula. Includes examples and common pitfalls.
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