 Wysłany: Śro 6:50, 09 Mar 2011 Temat postu: 100%. Thereforeto |
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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 cheap shoes for menyilai: nike high heels nike heels for women louis vuitton outlet http://www.darknessevolution.fora.pl/spam,19/nds-walking-a-key-to-good-health,40067.html#48337 |
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