Concentrations of nitrogen oxides and of hydrocarbons (recorded in ug/m3) were determined in 11 sites in a certain urban area. At 5% level of significance, test the hypothesis that both classes of air pollutants were present in the same concentration. Assume the data are not normally distributed. Sites Nitrogen oxides Hydrocarbons 104 108 2 116 118 84 89 4 77 71 5 61 66 84 83 7 81 88 8 72 76 61 68 10 97 96 11 84 81

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.