PHYS20009 Lecture Notes - Lecture 4: Standard Deviation, Data Analysis, Heart Rate
1 Feb 2020
School
Department
Course
Professor
Document Summary
Lecture 4: introduction to statistics, data analysis, and data presentation. Graph c has a changed scale: skews perception of data makes difference seem way bigger than it is, zooms in to enhance the difference, eg. Heart rate is 80-100 -> no need to start at 0 *** Graph b is really bad: scale is too big and random numbers, changing scale skews the size of standard deviation, no idea of where the mean is only see sd. B = before and after plot: joins the dots between measurements before and after, only good for small number of individuals. D: every dot is an individual, shows variance and range in data. Visualization of data can inform you about the data. R2 value is the correlation coefficient: 0 1. Dangerous correlations: correlation does not equal causation. Electric vehicles soar by 160%, prompting push for road use tax: 5241 (2013) -> 8334 (2018, only 0. 03% of cars were electric cars.
