An experiment is conducted to measure the impact of two-page brochure describing

Question

An experiment is conducted to measure the impact of two-page brochure describing the harmful effects of sugar on consumption of sugar-free soft drinks. 200 households are chosen for this experiment and are randomly divided into two groups (group 1 and group 2). A questionnaire about general food consumption levels is completed by both groups. Part of this questionnaire deals with current consumption levels of sugar free soft drinks. A booklet on general nutrition and good eating habits is left behind in all households, with one key difference: the booklets given to households in group 1 contain the two- page brochure on the ill effects of sugar, but those given to households in group 2 not. The heads of households in both groups are requested to read the booklets at their leisure. After an interval of 3 months, the households in both groups are re-contacted and requested to fill out the same questionnaire. What type of standard design is being used in the above experiment? Identify a threat to validity

Explanation / Answer

This is a case of Experimental Studies Design (Randomized Controlled Trial), where the samples selected based on suitable criteria are randomly allocated to receive experimental or controlled treatment, and both the groups are followed for a set time, and relevant measurements are taken to indicate the outcomes in each group.

The threat in this approach is the initial sellection of the samples, and hence there is the issue of generalization of the result.

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