11.6.6 an article in the journal of environmental engineering (vol. 115, no. 3, 1989, pp. 608–619) reported the results of a study on the occurrence of sodium and chloride in surface streams in central rhode island. the following data are chloride concentration y (in milligrams per liter) and roadway area in the watershed x (in percentage). y 4.4 6.6 9.7 10.6 10.8 10.9 11.8 12.1 14.3 14.7 15.0 17.3 19.2 23.1 27.4 27.7 31.8 39.5 x 0.19 0.15 0.57 0.70 0.67 0.63 0.47 0.70 0.60 0.78 0.81 0.78 0.69 1.30 1.05 1.06 1.74 1.62 round your answers to 3 decimal places. find a 99.00% confidence interval on each of the following: