The % by weight of the element Lead was also calculated for 
Definitions:
Nonparametric Statistics
Statistics used with data that cannot be assumed to have a normal distribution.
T Test
A statistical test used to compare the means of two groups and determine if they are significantly different from each other.
Chi-square Test
A method of statistical analysis utilized to ascertain the presence of a meaningful relationship between two variables of a categorical nature.
T Test
A statistical test used to compare the means of two groups to determine if there is a significant difference between them.
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