## Null hypothesis |

In **null hypothesis** is what you expect to happen before you run an experiment. The idea is that if the results don't reject the null hypothesis, then you aren't finding anything new or surprising. The most common null hypothesis is the "no-change" or "no-difference" *The design of experiments*.^{[1]}

Every

- If you do an experiment to see if a medicine works, the null hypothesis is that it doesn't work.
- If you do an experiment to see if people like chocolate or vanilla ice cream better, the null hypothesis is that people like them equally.
- If you do an experiment to see if either boys or girls can play piano better, the null hypothesis is that boys and girls are equally good at playing the piano.

The opposite of a null hypothesis is an **alternative hypothesis**. Some examples of alternative hypotheses are:

- This medicine makes people healthier.
- People like chocolate ice cream better than vanilla.
- Girls are better at playing the piano than boys.

- references

- ↑ Oxford English Dictionary: "null hypothesis," first usage: 1935 R.A. Fisher,
*The Design of Experiments*ii. 19, "We may speak of this hypothesis as the 'null hypothesis', and it should be noted that the null hypothesis is never proved or established, but is possibly disproved, in the course of experimentation".

Other Languages

العربية: فرضية العدم

azərbaycanca: Sıfır hipotezi

বাংলা: নাস্তি কল্পনা

català: Hipòtesi nul·la

dansk: Nulhypotese

eesti: Nullhüpotees

English: Null hypothesis

español: Hipótesis nula

euskara: Hipotesi nulu

فارسی: فرض صفر

français: Hypothèse nulle

한국어: 귀무 가설

हिन्दी: रिक्त परिकल्पना

italiano: Ipotesi nulla

Basa Jawa: Null hypothesis

norsk: Nullhypotese

português: Hipótese nula

русский: Нулевая гипотеза

کوردی: گریمانەی بەتاڵ

Basa Sunda: Null hypothesis

suomi: Nollahypoteesi

svenska: Nollhypotes

தமிழ்: பூஜ்ய கற்பிதக் கொள்கை

ไทย: สมมุติฐานว่าง

Türkçe: Sıfır hipotez

українська: Нульова гіпотеза

Tiếng Việt: Giả thiết không

中文: 零假设