Question
In: Statistics and Probability
Trace metals found in wells affect the taste of drinking water, and high concentrations can pose...
Trace metals found in wells affect the taste of drinking water, and high concentrations can pose a health risk. Researchers measured the concentration of zinc (in milligrams/liter) near the top and the bottom of 7 randomly selected wells in a large region. The data are provided in the following table. Construct and interpret a 90% confidence interval for the true mean difference (Bottom – Top) in the zinc concentrations of the wells in this region.
| well | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| bottom | 0.24 | 0.73 | 0.45 | 0.44 | 0.31 | 0.56 | 0.49 |
| top | 0.19 | 0.64 | 0.41 | 0.37 | 0.30 | 0.53 | 0.42 |
Solutions
Expert Solution
Solution-
Let X1 and X2 are the bottom and top well zinc concentration values.
orchestra answered 2 years agoRelated Solutions
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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...
Unusually high concentration of metals in drinking water can pose a health hazard. Twenty couples of...
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...
Unusually high concentration of metals in drinking water can pose a health hazard. Twenty couples of...
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...
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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...
Unusually high concentration of metals in drinking water can pose a health hazard. Twenty couples of...
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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
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North...
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