PSYCH 2220 Lecture Notes - Lecture 4: Level Of Measurement, Central Tendency, Harmonic Mean

• School: Ohio State University
• Department: Psychology
• Course: PSYCH 2220
• Professor: Seth Miller

Document Summary

We"re used to thinking of numbers as individual and unique: 2=2. Dealing with measured and summarized data requires a different view of numbers. Statistical view: numbers as approximations 2 means 2. 0, give or take a bit. Now is when we need to really start thinking of numbers as approximations. Mode most frequent number; most commonly occurring value in a data set. Median is middle number on list; when data has been arranged in increasing/decreasing order. Arithmetic mean sum of values divided by number of values (much more influenced by outliers) The sum of all values divided by number of values. Both m and x with a line above it (pronounced x-bar) are commonly used ti represent the mean of a sample. The symbol for mu is used to represent the population mean. Samples and population: samples and statistics - latin characters, populations and parameters greek characters.