Greta wants to do a study on how self-efficacy changes over the life span. her primary concerns are economic – she needs to do the study in the way that will cost the least in terms of time and money. given these concerns, she is probably going to be best served doing a(n) .

cross - sectional study

Explanation:

A cross - sectional study -

It involves the study by using many sources and data for a specific time period , is known as a cross - sectional study .

The example of a cross - sectional study is , data for the people suffering from cancer .

Hence , Greta is also performing a cross - sectional study .

the consumer demand because the members have to be aware if people are going to buy what they want to sell in this case either energy drinks or a car wash.

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 !