Scatterplots and Correlations. Scatterplots Describing relationship on bivariate data.
GENERATING Scatterplots and Correlations USING Ti84.
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Transcript of GENERATING Scatterplots and Correlations USING Ti84.
GENERATINGScatterplots
and Correlations
USING Ti84
plotting scatterplots using ti-84 / ti-89
Correlation measures the direction and
strength of the linear relationship between
two quantitative variables. Correlation is usually written as r
As always the summation sign __ means “add these terms for al the individuals,” is used in the formula for the correlation
“r.” (complex formula in stats)
to solve for the correlation of your data set, you will need to compute for:a) meanb) standard deviationc) z-score
You definitely need your
calculator to compute for
the correlation, which is still an arduous task to accomplish :)
Classifying Fossils: the length of two bones in five fossil specimens of the extinct beast
ARCHAEOPTERYX:
Femur 38 56 59 64 74
Humerus 41 63 70 72 84
r = .99
Possible correlations range from +1 to –1.
A zero correlation indicates that there is
no relationship between the variables.
A correlation of –1 indicates a perfect
negative correlation, meaning that as one
variable goes up, the other goes down.
A correlation of +1 indicates a perfect
positive correlation, meaning that both
variables move in the same direction
together.