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# CCGPSAlg-Unit 4

Association A connection between data values
Bivariate data Pairs of linked numerical observations
Box-and-Whisker Plot A diagram that shows the five-number summary of a distribution
Center Measures of center refer to the summary measures used to describe the most “typical” value in a set of data
Conditional Frequencies The relative frequencies in the body of a two-way frequency table
Correlation Coefficient A measure of the strength of the linear relationship between two variables that is defined in terms of the (sample) covariance of the variables divided by their (sample) standard deviations
Dot plot A method of visually displaying a distribution of data values where each data value is shown as a dot or mark above a number line
First Quartile (Q1) The “middle value” in the lower half of the rank-ordered data
Histogram
Interquartile Range A measure of variation in a set of numerical data
Line of best fit (trend or regression line) A straight line that best represents the data on a scatter plot
Mean absolute deviation A measure of variation in a set of numerical data, computed by adding the distances between each data value and the mean, then dividing by the number of data values
Outlier Sometimes, distributions are characterized by extreme values that differ greatly from the other observations. OUTLIER if the values lie outside these specific ranges:if the values lie outside these specific ranges: Median – (1.5 • IQR)& Median + (1.5 • I
Quantitative Variables Numerical variables that represent a measurable quantity
Residuals (error) Represents unexplained (or residual) variation after fitting a regression model
Scatter plot A graph in the coordinate plane representing a set of bivariate data
Second Quartile (Q2) The median value in the data set
Third quartile For a data set with median M, the third quartile is the median of the data values greater than M
Trend A change (either positive, negative or constant) in data values over time
Spread refers to the variability of the data. If the data cluster around a single central value, the spread is smaller. The further the observations fall from the center, the greater the spread or variability of the set.
Created by: Deigh