Statistics and Data Analysis Flashcards

Grade 9 · Math · Flashcards

Essential vocabulary for statistics and data analysis in Grade 9 Math.

Flashcards

Mean: The average; sum of all values ÷ number of values
Median: The middle value when data is arranged in order
Mode: The most frequently occurring value in a data set
Range: Max − Min; measures the total spread of data
Quartile: Values that divide an ordered data set into four equal parts
Q1 (First Quartile): The median of the lower half of data (25th percentile)
Q3 (Third Quartile): The median of the upper half of data (75th percentile)
IQR: Interquartile Range = Q3 − Q1; spread of the middle 50%
Outlier: A data value that is much higher or lower than most of the data
Box plot: A graph showing min, Q1, median, Q3, max — summarizes distribution
Histogram: A bar graph showing the frequency of data within equal intervals
Bimodal: A data set with exactly two modes