Biology 2244A/B Lecture Notes - Lecture 3: Pareto Chart, Bar Chart, Scatter Plot
11 Dec 2013
School
Department
Course
Professor
Document Summary
Variation measure of how much data varies amongst itself. Distribution shape of distribution of data. Outliers sample values lie outside range of most of data. Process: pick # of classes, find class width. Relative frequency distribution: equals class freq. divided by total frequency. Open-ended interval: 65+ - frequencies for all data 65 and above. Histogram: bar graph w/ classes and frequencies, relative frequency histogram use relative freq. instead of normal freq, pareto chart bar chart, categories on x-axis shown in decreasing frequency. Nominal: dot plot data is a point on scale of values, shows individual data points, scatter diagram when looking for correlation. Measures of center one more decimal than original values. Center the middle value of data. Mean average number: x-bar sample mean. Median middle value of data in order: x-squiggly (tilde) Weighted mean giving some numbers higher weight: sum(w*x)/sumw. Variation one more decimal than data used.
