Topic 4: Measures and Visualization of Variability Flashcards
A term used in statistics to express how a score compares to other scores in the same set.
percentile
50th percentile is also known as
Median
A type of quantile which divides the number of data points into four parts, or quarters, of more- or-less equal size.
quartile
The value at which 75% of the answers lie above that value and 25% of the answers lie below that value.
25th percentile
The difference between the third and first quartiles
interquartile range
Extreme values that stand out greatly from the overall pattern of values in a dataset or graph.
outliers
A chart that shows data from a five- number summary including one of the measures of central tendency.
boxplot
The value at which 50% of the answers lie above that value and 50% of the answers lie below that value
50th percentile
Interquartile Range Formula (Strictly no accronym)
interquartile range= third quartile - first quartile
The value at which 25% of the answers lie above that value and 75% of the answers lie below that value.
75th percentile
divides the data points in four equal parts
quartile
provides information on the spread of the data and where the data is concentrated
quartile
Median line in the “middle/mean”
Relatively symmetric
Median line below the “middle/mean” More space above it
Skewed to the right
positively skewed
Median line above the “middle”
More space below it Skewed to the left
negatively skewed
CAUSES OF OUTLIERS?
-data entry
-measurement errors
-natural variations
-sampling problems
to measure the spread of data. More ___ more spread the data is. but now tells where data is concentrated.
RANGE
tells whether there is an outlier or not.
boxplot
outliers/data points are extending bigger values/upward.
Mean is greater than median.
box partition is bigger than the lower area.
Positively skewd
outliers/data points are extending towards smaller values/downward.
Median is greater than the mean.
box partition is bigger than the upper area.
Negatively skewd
___ __ and ___ using to see if there is an outlier or not
Interquartile range and outlier