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BIOL 2060 (95)
Lecture

chap 3 textbook.docx

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School
Department
Biology
Course
BIOL 2060
Professor
Joel Shore
Semester
Fall

Description
Describing Data - Descriptive stats/summary stats: quantities that capture important features of frequency distributions - Most important are: location of frequency dist. And the spread. - Most important is the proportion: fraction of observations in a given category 3.1 Arithmetic mean and standard deviation - Mean is the most common metric to describe location of a freq. Dist. - Standard deviation is most used to measure dist. Of spread. - SAMPLE MEAN=average, line over Y ...ybar - Standard deviation: measures how far from the mean the observations typically are. ->calculated from the variance, square of the variance first take your value and subtract the mean from it, then square it. Add all those numbers together (sum of squares) then divide by one less than the total amount of observations, then square root it - Round to one decimal place bigger than your biggest decimal value in the numbers - Coefficient of variation (CV): calculates the standard deviation as a percentage of the mean 1
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