Question: In a study of recall memory three different questionnaires (A, B, C) were administered to nine subjects at three different times three months apart about

In a study of recall memory three different questionnaires (A, B, C) were administered to nine subjects at three different times three months apart about the number of trips to a shopping center during the preceding three months. Each time a different questionnaire was used and the order of the assignments of questionnaires for each subject was randomized.

(a) Is this study experimental, observational, or mixed? Why?

(b) Identify all factor(s), factor levels, and factor-level combinations.

(d) What is the basic unit of study?

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