Pen to take notes e with cho?
Chapter 5
Percentile - number of observations you observe below a data value
o To calculate you must standardize the data
o Explain every time you calculate area never just show calculations
o Example SAT scores
Typical scor
Stats Lecture 7 Chapter 8 & 9
01/26/2016
Chapter 8
Correlation Coefficient measures how closely related two variables are
o r is always between -1 and 1
o r = 0.5 does not represent any kind of percentage
o A data-set with, for instance, r = 0.8 does not
Stats Lecture 8 Chapter 10 & Chapter 11
01/28/2016
Chapter 10
Linear regression
o Method 1:
1. Find the span of the x-axis
2. Find the span of the y-axis
3. Divide each by 6 to estimate the SD
4. Find r
o Method 2 Z score approach to Linear Regression (w/
Stats Lecture 9 Chapter 11 & Chapter 12
02/02/2016
Chapter 11
Data:
o
o
o
o
Avg Lsat = 162, SD LSAT = 6
Avg GPA = 68, SD GPA = 10
r = 0.6
Make into scatterplot w/ football shape in positive direction, draw lines on the
axis for points of average
R.M.S. Er