29 terms

[Algebra II] Unit 11: Statistics

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Mode
The number that appears the MOst. May be one number, two numbers or no mode.
Range
Difference (subtract) between the highest and lowest number in a set of data.
Mean
x̄ on calculator.
Average - sum (+) of the data divided by the numbers of numbers in your data
n
Number of terms (shown on calculator.)
Lower Extreme (LE)
MinX on calculator.
Lowest term in a set of data.
Lower Quartile (LQ)
Q₁X on calculator.
Median of numbers from the number and below (-).
Median
MedianX on calculator.
When all the numbers are in order, it is the middle number.
If there are 2 numbers in the middle, average them.
Upper Quartile (UQ)
Q₃X on calculator.
Median of numbers from the number and above (+).
Upper Extreme (UE)
MaxX on calculator.
Highest term in a set of data.
Interquartile Range (IQR)
Upper Quartile - Lower Quartile
Outlier
When one of the numbers is extreme, do whisker test to figure out whether that number is a(n) _____. Put * on the ____ and extend box/whisker maximum/minimum to next highest/lowest term.
Whisker Length (WL)
IQR * 1.5
Lower Limit (LL)
Lower Quartile - Whisker Length
Upper Limit (UL)
Upper Quartile + Whisker Length
Stem and Leaf Plot
2 columns; arranges sets of data with tens on one side, and terms separated by commas on the other. *Don't forget the key* ex. 3|5 = 35
Box and Whisker Plot
5 number summary all dealing with the medians,
Q1, Q2, Q3, max and min
Normal Distribution
Mean (x̄) is in the middle of the graph; bell shape.
Percentile
Multiply n by a percent represented as a decimal (ex. 20 * 0.8 for 20 terms at the 80th ____) to get the term number. Then, terms that fall above or below this term number are part of the solution to this problem.
Variance
Measures how spread out the data is in relationship to the mean. Figure out by doing Mean of the Squares - Square of the Mean.
Standard Deviation (σ)
Take the square root of the variance, and you get this.
Used in normal distribution graphs as separators between x-axis values.
68
-1σ < x̄ < σ is ____%.
95
x̄ - 2σ < x̄ < x̄ + 2σ is ____%.
99.7
x̄ - 3σ < x̄ < x̄ + 3σ is ____%.
34
x̄ to 1σ is ____%.
13.5
1σ to 2σ is ____%.
2.35
2σ to 3σ is ____%.
0.15
3σ and above is ____%.
2-way table
Represents data in multiple columns and rows. Use logic to figure out missing data.
Fractions, Decimals
Probability - express answers as ____ and ____.