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Algebra 1 Unit 1 Statistics Review
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Terms in this set (25)
mean
"x-bar" The average of a set of data (The sum of the data divided by the total frequency)
outlier
Extreme high or low data value
statistics
The study of data
bivariate
Two-valued statistics (Statistics on 2 data sets)
quantitative data
Numerical data (counts or measurements)
Q3
Third or upper quartile (where 75% of the data lies at or below)
median
The middle value when the data is placed in numerical order
mode
Data value that has the largest frequency
standard deviation
Average of how far data values are from the mean
sample
Sub-group of the population
biased
Sample that is unfair/favored/skewed and/or not large enough (produces unreliable results)
scatter plot
A graph that shows pairs of data values as points
correlation
Relationship between variables (indicates the strength of the association between the variables)
unbiased
Sample that is large enough, random and fair; not favored (produces reliable results)
linear regression
Line of best fit (used to predict values not in the data set) fitting data to a linear equation
causation
Changes in one variable are the direct cause of changes in the other variable
frequency
A number that indicates how many
Q1
First or lower quartile (where 25% of the data lies at or below)
IQR
Interquartile range (Q3 - Q1)
correlation coefficient
r-value (measure of how well the data fits the regression)
measures of central tendency
Statistics that indicate where a typical piece of data will fall (mean, median, and mode)
range
Difference between the maximum value and minimum value of a data set
variation
Differences in a data set (diversity)
Data is more consistent (closer together/less spread) and has less diversity or variability.
When a data's set range, IQR and/or standard deviation is smaller, then...
When a data set contains outliers, the ________ should be used as the best measure of central tendency.
median (is never skewed or biased)
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