BIOL 3P96 Lecture Notes - Lecture 10: Null Hypothesis, Frequency Distribution, Standard Deviation
24 Jul 2015
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Document Summary
Biol 3p96 lecture 10: the normal distribution. Numerical variables that are measured, rather than counted. Many numerical variables have frequency distributions that are bell shaped. Peak (mode) is at the centre of the distribution, as are both the mean (average) and median. A continuous probability distribution describing a bell-shaped curve. A good approximation of the frequency distribution of many biological variables. A normal distribution is fully described by its mean and standard deviation. The normal distribution is common in nature. Probability is measured by the area under the curve rather than the height of the curve. The probability density is highest exactly at the mean. Mean, median and mode are all equal to each other. About two-thirds (68. 3%) of individuals are within one standard deviation of the mean, and. 95% are within about two (1. 96) standard deviations of the mean. Corresponds to the area under the curve.
