Statistics Ch 4

Card Set Information

Author:
firefly501
ID:
137595
Filename:
Statistics Ch 4
Updated:
2012-02-25 11:58:27
Tags:
statistics
Folders:

Description:
Scatterplots and Correlation Relationship between two variables
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user firefly501 on FreezingBlue Flashcards. What would you like to do?


  1. Scatterplots
    One axis represents each variable, data plotted as points
  2. Response /Dependent variable
    measures or records the outcome (y-axis)
  3. Explanatory /Independent variable
    explains changes in the response variable (x-axis)
  4. Form
    linear, non-linear, no relationship, curved, clustered
  5. Direction
    positive, negative, no direction
  6. Strength
    how much scatter around the main form
  7. Outliers
    deviations from the main pattern
  8. Correlation
    • Correlation coefficient (r) - a measure of the direction and strength of a relationship. It is
    • calculated using the mean and the standard deviation of both the x and y variables.

    • r ranges from -1 to +1
    • When variability in one or both variables decreases, the correlation coefficient gets
    • stronger (closer to +1 or −1).
    • Correlations are calculated using means and standard deviations and thus are NOT
    • resistant to outliers.

What would you like to do?

Home > Flashcards > Print Preview