The only relevant test of the validity of a hypothesis is comparison of prediction with experience.
Interpretation
A hypothesis is validated by how well its predictions align with actual experience.
Milton Friedman emphasizes that the true test of any hypothesis lies in its ability to make accurate predictions that match real-world experiences. This highlights the importance of empirical evidence in evaluating theories and the need for practical outcomes over mere theoretical consistency.
In practice
This quote can be used in a science class to explain how scientific methods validate hypotheses.
The economic miracle that has been the United States was not produced by socialized enterprises, by government-unon-industry cartels or by centralized economic planning. It was produced by private enterprises in a profit-and-loss system. And losses were at least as important in weeding out failures, as profits in fostering successes. Let government succor failures, and we shall be headed for stagnation and decline.
Universities exist to transmit knowledge and understanding of ideas and values to students not to provide entertainment for spectators or employment for athletes.
There is no place for government to prohibit consumers from buying products the effect of which will be to harm themselves.
There is one and only one social responsibility of business - to use it resources and engage in activities designed to increase its profits so long as it stays within the rules of the game, which is to say, engages in open and free competition without deception or fraud.
The great danger to the consumer is the monopoly -whether private or governmental. His most effective protection is free competition at home and free trade throughout the world. The consumer is protected from being exploited by one seller by the existence of another seller from whom he can buy and who is eager to sell to him. Alternative sources of supply protect the consumer far more effectively than all the Ralph Naders of the world.
The strongest argument for free enterprise is that it prevents anybody from having too much power. Whether that person is a government official, a trade union official, or a business executive. If forces them to put up or shut up. They either have to deliver the goods, produce something that people are willing to pay for, are willing to buy, or else they have to go into a different business.
Positive findings are around twice as likely to be published as negative findings. This is a cancer at the core of evidence-based medicine.
Global warming isn't a prediction. It is happening.
The scientist who yields anything to theology, however slight, is yielding to ignorance and false pretenses, and as certainly as if he granted that a horse-hair put into a bottle of water will turn into a snake.
My emotional investment is in finding truth. If string theory is wrong, I'd like to have known that yesterday. But if we can show it today or tomorrow, fantastic.
The central difficulty lies in the fact that all of the sciences have made such great progress during the last century that they have got quite beyond the reach of man
Well, biology today as I see it has an amiable look - quite different from the 19th-century view that the whole arrangement of nature is hostile, 'red in tooth and claw.' That came about because people misread Darwin's 'survival of the fittest.'
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