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By the end you can summarise a set of data honestly, say what it does and does not show, and spot a chart that is lying to you.
You want statistics to be something you can use and check, rather than a set of formulas you apply and hope.
Checking your progress…
Averaging something that is really a category is the first mistake anyone makes with data. Sorting number types first makes that mistake impossible for the rest of the course.
Open this step →Mean and median are the two answers to 'what is typical', and they disagree in exactly the situations worth noticing. Start here because everything else is measured against the centre.
Open this step →A centre with no spread is a half-truth, and it is the half most reports print. This step is what completes the previous one.
Open this step →Centre and spread put to work together, on data that was not arranged to be convenient. This is where the two previous steps become one skill.
Open this step →Describing what you have is safe; saying what it implies is not. Probability is the language for that jump, and it is only meaningful once you can describe a set properly.
Open this step →The end. Every skill above, turned outward at a chart built to persuade you — which is the form data will actually arrive in for the rest of your life.
Open this step →You finish able to write an honest summary of a data set, and to say out loud what a chart is quietly leaving out.
Once you have started this course it stays available to you, with your progress intact, even if it is later replaced.