Contrived observations alter the situation. In a sense experiments could be seen as extremely contrived observations. This category is under the heading “types of observation” because if only minor changes are made, it is called an observation. If major changes are made which allow a comparison, then it is called an experiment. Obviously however, it is a name for a position on a continuum. Experimental techniques do whatever is necessary to reveal what you need to know to better understand the world. Building on the previous metaphor, if knowledge were food, then experimentation is getting a meal by making it yourself. You have the power to optimize it in any way you want. You have complete freedom and are only limited by your own imagination and skill. However, if it doesn't reveal useful knowledge, then you have only yourself to blame. Experimental design gives you the
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