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Physical Sciences Permafrost is soil or rock that remains at or below 0°C for at least two years….

Physical Sciences Permafrost is soil or rock that remains at or below 0°C for at least two years. Suppose an Arctic study analyzed the observed changes in mean annual air temperature and the depth of the freezing layer. The depth of the upper surface of the permafrost layer (y, in feet) was measured for n = 26 mean annual air temperatures (x, in °F). The summary statistics are given below.

Physical Sciences Permafrost is soil or rock that remains at or below 0°C for at least two years....

a. Find the sample correlation coefficient.

b. Use the value of r from part (a) to describe the relationship between mean annual temperature and the depth of the permafrost layer.