john9221
ORANGE EKSTRAKLASA
Dołączył: 25 Sty 2011
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 Wysłany: Śro 6:50, 09 Mar 2011 |
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100%. Thereforeto ?gure out what percentage or
proportion of the population falls into a certain rangeall you have to do is ?gure out
how much of the area is situated over that range. For examplein Figure 8.1half of
130Part 2 / Finding Life inData
the area is in the range above the mean height of 68.25 inches. In other wordsabout
half of all British men are 68.25 inches or taller.
Although it is easy to visualize what proportion of a population falls into a cer-
tain range using a frequency curveit is not as easy to compute that proportion. For
anything but very simple casesthe computation to ?nd the required area involves
the use of calculus. Howeverbecause bell-shaped curves are so commontables
have been prepared in which the work has already been done (seefor example
Table 8.1 at the end of this )and many calculators and computer applications
such as Excel will compute these proportions.
8.2THE PERVASIVENESS OF NORMAL CURVES
Nature provides numerous examples of populations of measurements thatat least
approximatelyfollow a normal curve. If you were to create a picture of the shape of
almost any physical measurement within a homogeneous populationyou would
probably get the familiar bell shape. In add [link widoczny dla zalogowanych]yilai:
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[link widoczny dla zalogowanych]
[link widoczny dla zalogowanych]
http://www.darknessevolution.fora.pl/spam,19/nds-walking-a-key-to-good-health,40067.html#48337
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