Refer to Exercise 76. Construct and interpret a 95% confidence interval for the true mean difference (Bottom – Top) in the zinc concentrations of the wells in this region.

Exercise 76.

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 10 randomly selected wells in a large region. The data are provided in the following table.

Transcribed Image Text:

Well 1 2 3 5 6 7 8 10 Bottom 0.430 0.266 0.567 0.531 0.707 0.716 0.651 0.589 0.469 0.723 Тоp 0.415 0.238 0.390 0.410 0.605 0.609 0.632 0.523 0.411 0.612 Difference 0.015 0.028 0.177 0.121 0.102 0.107 0.019 0.066 0.058 0.111