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Unit Two: Stat 2820 - Coggle Diagram
Unit Two: Stat 2820
Experiment design
Retrospective Study
Prospective study
randomize!!
manipulating
factor levels
compare responses
blocking
compare
replicate
confounding
Surveys
Big Three ideas
SRS
Stratified
cluster
response bias
non-response bias
bad sampling designs
Write a good survey!
linear regression
how to find the line of best fit
how the line of best fit is created
what does the slope mean?
what does the intercept mean?
R^2
Check the residual!
scatterplots
quantitative variables
form
strength
direction
correlation coefficeint
meaning
Problems with Regression
extrapolation
leverage point
influential points
Check the residuals
Don't work with summary data!