It Is Sometimes Useful to "Jitter" Data When Viewing a Scatterplot

question 5

Multiple Choice

It is sometimes useful to "jitter" data when viewing a scatterplot involving dummy variables. To jitter data we

• A) Add a small random number to both the independent and dependent variable before running the regression.
• B) Add a small random number to both the independent and dependent variable to the plotted data.
• C) Add a small random number to both the independent and dependent variable before running the regression and to the plotted data.
• D) None of the above.

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Definitions:

Error Mean Square

A measure used in statistics to quantify the average of squares of errors or deviations.

Sums of Squared Deviations

The total of the squared differences between each observation in a data set and the mean of that data set, used in various statistical methods to measure variability.

Sample Mean

The average value calculated from a subset (sample) of a population.

ANOVA Table

A table used to summarize the results and findings of an Analysis of Variance, displaying sources of variance, degrees of freedom, and significance levels.