Consider (i) Pollutant concentrations are generally modeled as lognormal;(ii) concentrations are generally Poisson;(iii) weekly exceedance frequency is generally lognormal;(iv) weekly exceedance frequency is generally Poisson. Select all correct options.
Correct answer: (A) (i) and (iv) correct; (B) (i) correct and (iii) incorrect
Explanation
Positive, right-skewed concentration data are often modeled with a lognormal distribution. Counts of rare, independent exceedances over a fixed period can be modeled by Poisson. Thus (i),(iv) are the intended true statements and (ii),(iii) false, so **A, B**. These are modeling conventions requiring distributional and event-independence checks, not universal laws.
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