Example 7: Correlating two samples

You measured the strength of a spring at a breaking point based on the pressure at which it was produced. Your assumption is that breaking strength is correlated to pressure.

Question: Are the two variables linked/dependent?

Correlation entre deux variables

Which test do you choose ?

Left hand table: Depending on the comparison to be carrid out This test does not appear in left hand table.

Right hand table: Depending on the types of variables Y is the result of the resistance measurement (quantitative) based on (X) a measure of production pressure (quantitative).  The test you should choose is simple regression.

Choix du test

To analyze the data, enter the values by organizing them into two columns.


Result :

Resultat test statistique

Based on the regression test, the correlation between pressure and resistance is not significant.  We can, therefore, not conclude that production pressure has an impact on a product’s resistance.