StatPi
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The problem set is open, the numbers are in the formula, and nothing says why this test and not the one next to it. Start where you are stuck.
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Use StatPi Lite
Type the numbers from your problem and see every step to the answer. Opens in your browser, no account, nothing to install.
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Sun Nov 8, 7 to 9 PM ET, free
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Send the question you are stuck on. Professor Paul Weiss works it live, step by step, so you leave knowing why each step is there.
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StatPi, full edition
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For when the course reaches tests and intervals and the exam asks which test and why. Two variables, tests, intervals, ANOVA and live class sessions, every step written out, the same answers R gives. $30 once, no subscription.