In my earlier posts on hypothesis testing and confidence intervals, I covered how there are two hypotheses – the default or null hypothesis, and the alternative hypothesis (which is like a logical opposite of the null hypothesis). Hypothesis testing is fundamentally a decision making activity, where you reject or fail to reject the default hypothesis. […]Read more "Power, Difference and Sample Sizes"
If you were to walk into a restaurant and order a cup of coffee, you’d expect to get a standard cup of the stuff, and you’d expect to get a sufficient quantity of it too. How much coffee for a certain price is too much, and how much is too little? More realistically, when you […]Read more "Confidence Intervals and t-tests in R"