stattrek.com
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Stat Trek is an online statistics resource offering step-by-step tutorials and free calculators for topics like probability, distributions, hypothesis testing, confidence intervals, sample size, and power analysis.
More resources on Hypothesis Testing
Statistics with Python
Coursera course: Statistics for Data Science with Python
Statistics for Business and Economics
Statistics for Business and Economics - A book resource
statisticshowto.com
Statistics How To is a practical statistics learning site that explains core concepts with clear, step-by-step tutorials and worked examples. It covers hypothesis testing (including p-values and test types) along with a wide range of other stats topics and handy calculators.
Introduction to Statistical Learning
Introduction to Statistical Learning - A book resource
Data Analysis and Statistical Inference
Increase your quantitative reasoning skills through a deeper understanding of probability and statistics, with the engaging "Fat Chance" approach that's made this course a favorite among learners worldwide.
ocw.mit.edu
MIT OpenCourseWare is a free, open educational resource that provides lecture notes, assignments, and exams from MIT courses, including statistics and probability topics that cover hypothesis testing.