TODAY IN SCIENCE HISTORY ®  •  TODAYINSCI ®
Celebrating 24 Years on the Web
Find science on or your birthday

Today in Science History - Quickie Quiz
Who said: “Politics is more difficult than physics.”
more quiz questions >>
Home > Category Index for Science Quotations > Category Index S > Category: Standard Deviation

Standard Deviation Quotes (3 quotes)

Conclusions
I. A curve has been found representing the frequency distribution of standard deviations of samples drawn from a normal population.
II. A curve has been found representing the frequency distribution of values of the means of such samples, when these values are measured from the mean of the population in terms of the standard deviation of the sample…
IV. Tables are given by which it can be judged whether a series of experiments, however short, have given a result which conforms to any required standard of accuracy or whether it is necessary to continue the investigation.
'The Probable Error of a Mean', Biometrika, 1908, 6, 25.
Science quotes on:  |  Accuracy (81)  |  Conclusion (266)  |  Continue (179)  |  Curve (49)  |  Deviation (21)  |  Distribution (51)  |  Experiment (736)  |  Frequency (25)  |  Investigation (250)  |  Mean (810)  |  Means (587)  |  Necessary (370)  |  Population (115)  |  Required (108)  |  Result (700)  |  Sample (19)  |  Series (153)  |  Short (200)  |  Statistics (170)  |  Table (105)  |  Term (357)  |  Terms (184)  |  Value (393)

Hardly a year passes that fails to find a new, oft-times exotic, research method or technique added to the armamentarium of political inquiry. Anyone who cannot negotiate Chi squares, assess randomization, statistical significance, and standard deviations
…...
Science quotes on:  |  Add (42)  |  Anyone (38)  |  Armamentarium (3)  |  Assess (4)  |  Chi (2)  |  Deviation (21)  |  Exotic (8)  |  Fail (191)  |  Find (1014)  |  Hardly (19)  |  Inquiry (88)  |  Method (531)  |  Negotiate (2)  |  New (1273)  |  Pass (241)  |  Political (124)  |  Research (753)  |  Significance (114)  |  Square (73)  |  Statistics (170)  |  Technique (84)  |  Time (1911)  |  Year (963)

When there are two independent causes of variability capable of producing in an otherwise uniform population distributions with standard deviations s1 and s2, it is found that the distribution, when both causes act together, has a standard deviation vs12 + s22. It is therefore desirable in analysing the causes of variability to deal with the square of the standard deviation as the measure of variability. We shall term this quantity the Variance of the normal population to which it refers, and we may now ascribe to the constituent causes fractions or percentages of the total variance which they together produce.
'The Correlation between Relatives on the Supposition of Mendelian Inheritance,' Transactions of the Royal Society of Edinburgh, 1918, 52, 399.
Science quotes on:  |  Act (278)  |  Both (496)  |  Capable (174)  |  Cause (561)  |  Constituent (47)  |  Deal (192)  |  Desirable (33)  |  Deviation (21)  |  Distribution (51)  |  Genetics (105)  |  Measure (241)  |  Population (115)  |  Quantity (136)  |  Square (73)  |  Statistics (170)  |  Term (357)  |  Together (392)  |  Total (95)  |  Two (936)  |  Variance (12)

In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
Sitewide search within all Today In Science History pages:
Visit our Science and Scientist Quotations index for more Science Quotes from archaeologists, biologists, chemists, geologists, inventors and inventions, mathematicians, physicists, pioneers in medicine, science events and technology.

Names index: | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

Categories index: | 1 | 2 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Thank you for sharing.

Science T-Shirts from Amazon

See more at Amazon

by Ian Ellis