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  • Research Methods Knowledge Base : The t-Test

    This particular textbook lesson addresses the independent t-test. It presents to the user how to compute the t statistic and then how to interpret the results.

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  • Z-test for difference between means

    A slideshow presentation with two good examples on using the Z-test for the difference between two means. Gives some good "plain language" interepretations of what "statistically significant difference" means.

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  • HyperStat Online: Ch. 4 Introduction to Probability

    This chapter of the HyperStat Online Textbook presents six sections on probability including conditional probability, unions, intersections, and the Binomial distribution. A link to exercises for the chapter is available, as well as a link to an applet that demonstrates the approximation of the binomial with a normal distribution (in section 5).

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