A nine-year-old tested professional touch therapists. Using a cardboard partition, she held a hand above one of the therapist's hands, and the therapist was asked to identify the hand that was chosen. What type of study is this? What are the variables of interest?

Observational study.

The variable which is of interest is the result of either correct or incorrect for each trial.

Explanation:

In Observatory study, researchers observe or measure characteristics of the subjects, but do not attempt to influence or modify these characteristics. As in this case, the study type clearly points at observational study as the aim is only to bxerve the therapist with  no attempt to influence the outcome.

no

explanation:

every society, in order to meet the needs of it's people, has to answer three basic questions:

- what should we produce?

- how should we produce it?

- for whom should we produce it?

this questions must be answered in order to, option b, aid in production decisions.

every country can't produce everything, no matter how rich their land is. it may be a matter of technology, resources or geographical conditions. so, these three questions must be resolved in order to get the most of the production of each land.

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