Question
Unusually high concentration of metals in drinking water can pose a health hazard. Twenty couples of data were taken from different locations of X Lake
Unusually high concentration of metals in drinking water can pose a health hazard. Twenty couples of data were taken from different locations of X Lake measuring zinc concentration in bottom water and surface water.
Table 1. Zinc Concentration (mg/l) in bottom and surface water in different regions and areas of X Lake
Location | Region | Area | Zinc_Bottom | Zinc_Surface | Zinc_Mean | TZ3_Mean |
Loc 1 | North | Area A | 0.51 | 0.49 | 0.50 | 2.67 |
Loc 2 | North | Area A | 0.46 | 0.45 | 0.46 | 2.45 |
Loc 3 | North | Area A | 0.52 | 0.52 | 0.52 | 2.66 |
Loc 4 | North | Area A | 0.51 | 0.50 | 0.50 | 2.56 |
Loc 5 | North | Area A | 0.58 | 0.57 | 0.58 | 3.03 |
Loc 6 | North | Area A | 0.57 | 0.55 | 0.56 | 3.21 |
Loc 7 | North | Area A | 0.59 | 0.58 | 0.59 | 3.50 |
Loc 8 | North | Area B | 0.46 | 0.44 | 0.45 | 2.40 |
Loc 9 | North | Area B | 0.46 | 0.44 | 0.45 | 2.35 |
Loc 10 | North | Area B | 0.45 | 0.43 | 0.44 | 2.56 |
Loc11 | East | Area B | 0.41 | 0.40 | 0.41 | 1.33 |
Loc 12 | East | Area B | 0.41 | 0.39 | 0.40 | 1.56 |
Loc 13 | East | Area B | 0.41 | 0.39 | 0.40 | 1.23 |
Loc 14 | East | Area B | 0.47 | 0.45 | 0.46 | 1.12 |
Loc 15 | East | Area C | 0.41 | 0.39 | 0.40 | 1.23 |
Loc 16 | East | Area C | 0.37 | 0.36 | 0.37 | 1.10 |
Loc 17 | East | Area C | 0.41 | 0.39 | 0.40 | 1.20 |
Loc 18 | East | Area C | 0.40 | 0.39 | 0.39 | 1.10 |
Loc 19 | East | Area C | 0.39 | 0.37 | 0.38 | 1.12 |
Loc 20 | East | Area C | 0.46 | 0.44 | 0.45 | 1.30 |
QUESTION
Does the data suggest that the true average zinc concentration change due to Area? Formulating your hypothesis and providing an explanation on the reason of your choice, conduct the appropriate test and interprete your results (=0.05). If necessary, conduct a post-hoc test.
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