In: Statistics and Probability
Unusually high concentration of metals in drinking water can pose a health hazard. Twenty couples of data were taken from different locations of Karakaçan 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 Karacakaçan 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 concentration in the north region is higher than that of east region? Formulating your hypothesis and providing an explanation on the reason of your choice, conduct the appropriate test and interprete your results (α=0.05).