The data and plot in Display 3.79 are from E15 on page 135. They show the arsenic concentrations in the toenails of 21 people who used water from their private wells. Both measurements are in parts per million.
a. Which point do you think has the most influence on the slope and correlation? What would be the effect of removing this point? Perform the calculations to see if your intuition is correct.
b. Find a point that you think has almost no influence on the slope and correlation. Perform the calculations to see if your intuition is correct.
c. Find a point whose removal you think would make the correlation increase. Perform the calculations to see if your intuition is correct.
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