(Almansour KS, Arisco NJ, Woo MK, Young AS, Adamkiewicz G, Hart JE. Playground lead levels in rubber, soil, and, and mulch surfaces in Boston. PLoS One. 2019 Apr 25;14(4):e021615, https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0216156)

Conduct a repeated-measures ANOVA in SPSS to test the difference in zinc levels between all 4 surfaces. Write your hypothesis, state if you reject or fail to reject the null hypothesis, and write a conclusion