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This resource explains how to conduct a paired t-test, a test that is sometimes more appropriate to you in place of a two sample t-test. The paired t-test is really just a special form of a one sample t-test, where the “true value” is equal to zero.
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Decimals & Significant Figures - Diagnostic Test
Test your knowledge of decimal places
Decimals & Significant Figures - Exercise
Revise what you have learned about decimal places.
Rules of Arithmetic - Exercise
Test your knowledge of the rules of arithmetic
Video demonstrating Rules of Arithmetic
Launch Rules of Arithmetic - Video