The gold standard of research designs are: Question 30 options: a) Adequate sample sizes b) Randomized controlled trials c) Free of known bias d) Adequate pilot testing

b) Randomized controlled trials

Explanation:

Randomized controlled trials are usually viewed as the "gold standard of research designs" because they have a great potential of limiting or even eliminating all sorts of bias, and, therefore, provide the highest level of evidence when performing a research.

The answer is b) Randomized controlled trials

B) Randomized Controlled trials

Explanation:

Randomized controlled trial is (RCT) study in which people are allocated at random  to receive one of several clinical interventions.A Randomized Controlled Trial is an experiment or study conducted in such a way that as many sources of bias as possible are removed from the process.

Of all the many ways research can be conducted, the gold standard level of proof where treatments and therapies are concerned is the Randomized Controlled Trial (RCT). ...

is there a answer choice?

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.

hope this !