4. A researcher wishes to study the effects of pesticide use on the quality of surface water in a major rice-growing region of Guyana. She proposes to conduct a field survey to (a) obtain information on pesticide application practices used by farmers and (b) obtain water samples for purposes of laboratory analysis.

(a) Recommend an appropriate sampling technique for this study.

(b) Justify your choice.

(c) Give an example of an open-ended question relevant to the study.

(d) Give an example of a closed-ended question relevant to the study.

(e) Give an example of a demographic feature that may be omitted on ethical grounds.

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