BIOL361 Lecture Notes - Lecture 4: Standard Deviation, Central Tendency, Skewness
10 Apr 2016
School
Department
Course
Professor
Document Summary
Lecture 4: descriptive statistics a very important 1st step in any data analysis exploring and summarizing a sample of data involves graphs and numerical summaries. Two main purposes: for a researcher to explore their own data show data from different perspectives, to summarize and display the data in the best way possible to inform others about the important features of the data. C. shape shape of distribution of the data. Harmonic mean reciprocal of arithmetic mean. Geometric mean useful when data is highly skewed. * round mean , standard deviation and coefficient of variance to one more decimal place than used for original data set. Midrange middle value of a range = (max + min)/ 2. Spread refers to variability of the data. Biological, imprecision or experimental error and blunders. Variation refers to the amount that scores vary amongst themselves. Scores close together result in low measure of variation. 2 = (x- ))2/ n: standard deviation (sd or s)
