Both a gravimetric and a spectrophotometric method are under consideration for determining phosphate content of a particular material. Twelve samples of the material are obtained, each is split in half, and a determination is made on each half using one of the two methods, resulting in the following data:
![](https://test.transtutors.com/qimg/ebe076ad-8b41-47e6-a11c-ec492cfcf595.png)
![](https://test.transtutors.com/qimg/379a6f35-413c-47b3-9fc6-0e917d0ac6a3.png)
Use the Wilcoxon test to decide whether one technique gives on average a different value than the other technique for this type of material