Hypothesis testing made easy

Carrying out a hypothesis test often causes confusion. Here's how it works. Some hypothesis tests start with a known fact, such as "25% of patients treated for a particular disease will suffer side effects." A drug company may then claim that "a new treatment reduces the number of patients suffering side effects." The original figure, the status quo, is known as the "null hypothesis" and given the symbol H0. The new claim is called the "alternative hypothesis" and given the symbol ...

TOK and Counterfactual History

"Those who cannot learn from history are doomed to repeat it." Ho hum? Heard this before? In the first place, this famous "quotation" is apparently a distortion--albeit a slight distortion--from George Santayana's actual assertion, "Those who cannot remember the past are condemned to repeat it. " More to the point, the statement raises important questions about the nature of historical knowledge. In fact, it doesn't really matter what a particular philosopher actually said (or even whether, as is often claimed, ...