. Biological effects of radiation; mechanism and measurement of radiation, applications in biology, photochemical reactions, effects of radiant energy on organisms and organic products. Radiation; Biology. STATISTICAL TREATMENT 235 where by origin we mean the scale reading corresponding to the zero position for x, and 2 stands for summation, Standard deviation = a \ 2/ \^f) Since these measurements are expressed in terms of , it is necessary to multiply the mean and standard deviation by in order to get the values in terms of microns. This process was followed in determining the means
. Biological effects of radiation; mechanism and measurement of radiation, applications in biology, photochemical reactions, effects of radiant energy on organisms and organic products. Radiation; Biology. STATISTICAL TREATMENT 235 where by origin we mean the scale reading corresponding to the zero position for x, and 2 stands for summation, Standard deviation = a \ 2/ \^f) Since these measurements are expressed in terms of , it is necessary to multiply the mean and standard deviation by in order to get the values in terms of microns. This process was followed in determining the means and standard deviations given in Table 5. If, as is not. 8 9 I 10 Ti 12 13 14 I 15 ^16 Il7 18 19 | 20 21 I Units of OS Microns -2 -1 Mean +1 +2 +3 Units of 1 cr Length Fig. 2.—Distribution of length of bodos. infrequently the case, a change of one in the x scale corresponds to a change of something other than one in the scale of measurement, adjust- ment for this scale change must be made in the mean and standard deviation. Before proceeding to the interpretation of these constants it will be necessary to consider their sampling variation, that is, the extent to which they vary under repeated tests. Study of the theory of errors shows that determination of the arithmetic mean from repeated samples out of the same experience leads to a set of means that are distributed according to a normal probability curve. The standard deviation of this curve is called the standard error of the mean and measures the variation in the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Duggar, Benjamin M. (Benjamin Minge), 1872-1956; National Research Council (U. S. ). Committee on the Effects of Radiation on Living Organisms; Clark, Janet Howell, b. 1889; Cole, Kenneth Stewart, 1900-; Daniels, Farrington, 1889-1972. New Yor
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