Question

6 soil grab samples were collected from a contaminated site. Analytical results are presented in Table. Based on the results indicate how many grab samples needed to retrieve from site if statistical goal is to obtain RSD 2% to be associated with data?

Grab Sample 1
Analytes Arsenic Concentration (mg/kg) 3.79
Analytes Manganese Conc 9.32
Analytes Cobalt Conc 5.21
Analytes Lead Cone 10

Grab Sample 2
Analytes Arsenic Conc 1.24
Analytes Manganese Conc 0.95
Analytes Cobalt Conc 2.22
Analytes Lead Conc 6

Grab Sample 3
Analytes Arsenic Conc 2.26
Analytes Manganese Conc 6.34
Analytes Cobalt Conc 8.87
Analytes Lead Conc 12

Grab Sample 4
Analytes Arsenic Conc 1.55
Analytes Manganese Conc 4.32
Analytes Cobalt Conc 6.72
Analytes Lead Conc 11

Grab Sample 5
Analytes Arsenic Conc 3.99
Analytes Manganese Conc 7.32
Analytes Cobalt Conc 6.21
Analytes Lead Conc 9

Grab Sample 6
Analytes Arsenic Conc 6.89
Analytes Manganese Conc 8.87
Analytes Cobalt Conc 5.21
Analytes Lead Conc 10