Statistical Sciences 1023A/B Chapter 8: Chapter 8 Bell Shaped Curves and Other Shapes
23 Mar 2017
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Chapter 8: bell shaped curves and other shapes. Most common type of picture for a population is a smooth frequency curve. Instead of drawing lots of tiny rectangle, picture is drawn as if the tops of the rectangles were connected with a smooth curve. A population of measurements that follow a normal distribution is said to be normally distributed. Frequency curves are quite useful for determining what proportion or percentage of the population of measurements falls into a certain range. Represents the position of your measurement in comparison with the rest of the data. Gives the percentage of the population that falls below you. If you are in the 50th percentile, half of the population is below you. Represents the number of standard deviations the observed value or score falls from the mean. A normal curve with a mean of 0 and a standard deviation of 1 is called a standard normal curve.
