A researcher conducted an Independence test by using data consisting of 2 categorical variables: Zip code and Diet. Her data can be organized into a 5 by 5 contingency table. If she found the test statistic $\displaystyle \chi^{{2}}=$18.37:

What is the degree of freedom of the $\displaystyle \chi^{{2}}$ statistic?

What is the P-value of the Independence test? (Round to 3 decimals)

Given the significance level of 0.1, what can she conclude from the test?