Unit 1 Flashcards
Median
Mid point
Mean
Average
Represented with an x and a line over it
Mean
Represented with M
The midpoint
What center method do outliers affect
Mean
In a model skewed right
Mean > median
Skewed left?
Mean < median
How to find quartiles
Put data in order
Cut into4 sections
IQR
Difference between the upper quartile and the lower quartile
Outlier formula
Outlier < Q1 - 1.5(IQR)
Outlier > Q3 + 1.5(IQR)
Five number summary for box and whisker plots
Min Q1 Median Q3 Max
In a box plot, if a median is closer to the maximum
Skewed left
Standard deviation
Average distance the observations are away from the mean
Variance
Average of the square of the deviations
How to find variance
Take the difference of each number
Square it
Add
Average the result
Measures of spread
Range
IQR
Standard deviation
Measures of center
Median and mean
When there are outliers present use..
IQR and median
When there are no outliers
Mean, range, standard deviation
Graphs for categorical
Bar
Pie
Simpson’s paradox
Third variable
Graphs for quantitative
Dot
Stem