Saturday, October 22, 2011

Judging the Fit of an LSRL

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We have said in a previous post that the LSRL represents the best possible fitting line for the data association. But an LSRL, while best po...
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Saturday, October 15, 2011

Correlation and Linear Regression

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When two quantitative variables have a linear relationship, we classify the association as strong, moderate, or weak. However, we can also q...
1 comment:
Sunday, September 18, 2011

Associations Between Two Variables

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Up till now, we've been analyzing one set of quantitative data values, discussing center, shape, spread, and their measures. Sometimes t...
Monday, September 5, 2011

The Standard Normal Model: Standardizing Scores

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For the purposes of this post, we will refer to the data values in a data set as "scores." In the last post, we used an example ...
5 comments:
Wednesday, August 31, 2011

More About the Normal Distribution: the 68-95-99.7 Rule

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In the last post, we covered the Normal distribution as it relates to the standard deviation. We said that the Normal distribution is really...
1 comment:
Saturday, August 27, 2011

More About Standard Deviation: The Normal Distribution

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I've haven't said a lot about Standard Deviation up to now: not much more than the fact that it's a measure of spread for a sym...
2 comments:
Saturday, August 20, 2011

Analyzing Quantitative Distributions

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This post deals only with quantitative data. When you have a quantitative dataset, it is always a good idea to look at a graphical display...
1 comment: