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Statistics

stem and leaf plot a visual representation of data in which the unit’s and ten’s are represented in separate columns
statistics collecting, organizing, analyzing, interpreting data and drawing conclusions based on the data
measures of central tendencies statistical values generally located toward the center of a distribution
frequency polygon a line graph which connects midpoints of the histogram bars
data value the numerical value associated with a data item
midrange value found by averaging the highest and lowest data values
data numerical information
mean arithmetic average of all numerical data items
grouped frequency distribution data items organized into appropriate numerical groups
histogram bar graph in which bars touch and the frequency is the vertical axis
mode data item with the greatest frequency
median the middle value when data items are arranged in order from least to greatest
inferential statistics draws conclusions from collected data
descriptive statistics concerned with collecting, organizing, summarizing, & presenting data
sample a subset or subgroup of the population
population set containing all people or objects described & analyzed by data collector
random sample sample obtained in such a way that every element in the population has an equal chance of being selected for the sample
range difference between the highest and lowest values in a data set
normal distribution a distribution of data in which the mean, median, and mode are all equal
z-score describes how many standard deviations a data item in a normal distribution lies above or below the mean
Created by: mcchesney