Question

1. Trace metals in drinking water affect the flavor of the water, and unusually high concentration can pose a health hazard. Six samples were taken by four different field scientists and showed trace-metal concentrations (zinc, in mg/L) for both surface water and bottom water at six different river locations. Their theory was that surface water concentration (x) is predictive of bottom water concentration (y). Location Surface Bottom 1 0.415 0.430 2 0.238 0.266 3 0.390 0.567 4 0.410 0.531 5 0.605 0.707 6 0.609 0.716 What initial questions might we ask the four scientists about their sampling methods? (2 points) If we were to calculate the value of the correlation coefficient, what would we be hoping to see in that calculation? What kind of relationship are we expecting we will see between the relationship between metal concentrations in surface and bottom water? (2 points)

          1. Trace metals in drinking water affect the flavor of the water, and unusually high concentration can pose a health hazard. Six samples were taken by four different field scientists and showed trace-metal concentrations (zinc, in mg/L) for both surface water and bottom water at six different river locations.

Their theory was that surface water concentration (x) is predictive of bottom water concentration (y).

Location Surface Bottom
1 0.415 0.430
2 0.238 0.266
3 0.390 0.567
4 0.410 0.531
5 0.605 0.707
6 0.609 0.716

What initial questions might we ask the four scientists about their sampling methods? (2 points)

If we were to calculate the value of the correlation coefficient, what would we be hoping to see in that calculation? What kind of relationship are we expecting we will see between the relationship between metal concentrations in surface and bottom water? (2 points)

1. Trace metals in drinking water affect the flavor of the water, and unusually high concentration can pose a health hazard. Six samples were taken by four different field scientists and showed trace-metal concentrations (zinc, in mg/L) for both surface water and bottom water at six different river locations.

Their theory was that surface water concentration (x) is predictive of bottom water concentration (y).

Location Surface Bottom
1 0.415 0.430
2 0.238 0.266
3 0.390 0.567
4 0.410 0.531
5 0.605 0.707
6 0.609 0.716

What initial questions might we ask the four scientists about their sampling methods? (2 points)

If we were to calculate the value of the correlation coefficient, what would we be hoping to see in that calculation? What kind of relationship are we expecting we will see between the relationship between metal concentrations in surface and bottom water? (2 points)

Added by Claudia G.

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