?Secchi Disk A Secchi disk is an 8-inch-diameter weighted disk painted black and white and attached to a rope. The disk is lowered into water, and the
Chapter 15, Problem 15(choose chapter or problem)
Secchi Disk A Secchi disk is an 8-inch-diameter weighted disk painted black and white and attached to a rope. The disk is lowered into water, and the depth (in inches) at which it is no longer visible is recorded. The measurement is an indication of water clarity. An environmental biologist interested in discovering whether the water clarity of the lake at Joliet Junior College is improving takes measurements at the same location during the course of a year and repeats the measurements on the same dates five years later. She obtains the results shown. Do you believe that the clarity of the lake is improving? Use the = 0.05 level of significance.
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