The following data give the average pH in rain/sleet/snow for the 2-year period XXXXXXXXXXat 20 rural sites on the U.S. West Coast. (Source: National Atmospheric Deposition Program.) (a) Box plot...

The following data give the average pH in rain/sleet/snow for the 2-year period 20042005 at 20 rural sites on the U.S. West Coast. (Source: National Atmospheric Deposition Program.)

(a) Box plot these data and identify any anomalous observations.

(b) Would the sample mean or the sample median be a better descriptor of typical pH values?

(c) Use the alternative method described in Section 4.7 to test the null hypothesis that the median pH is at least 5.40.

5.335 5.345 5.395 5.305 5.315

5.380 5.520 5.190 5.455 5.330

5.360 6.285 5.350 5.125 5.115

5.510 5.340 5.340 5.305 5.265