STATISTICS PRACTICE GUIDE 2026
REGRESSION ANALYSIS AND
CORRELATION PRINCIPLES
◉ Scatter plot
Answer: A graphical representation of Q -> Q
◉ Two way table
Answer: A graphical representation of C -> C
◉ Side-by side box
Answer: A graphical representation of C -> Q
◉ Interpolation
Answer: Making predictions *within* the range of your data. This is
usually accurate.
◉ Extrapolation
, Answer: Making predictions *outside* of the range of your data. This
is generally a bad idea.
◉ Simpson's Paradox
Answer: When split up, each data set can have a pattern which goes
away when all the data is combined.
◉ Prospective study
Answer: Is a study that's done over time to find results / A study
watching for outcomes during the study period
◉ Unbalanced response
Answer: Giving more options that are negative than positive options
(or vice versa) which biases the responses towards the more
common option
◉ Matched pairs
Answer: Grouping two similar subjects and giving different
treatments/procedures to each in order to compare the differences.
For example, having one twin take a medication while the other twin
does not.
◉ Population
Answer: The entire group you are trying to describe or understand.