What is the main purpose of randomization?

a.to prevent the control effect by ensuring that participants do not know if they are taking the control or the intervention.

b.to control for confounding by distributing known and unknown confounders equally.

c.to prevent researchers from manipulating their test subjects in order to have favourable results.

d.to ensure that participant adhere to the study protocol.

Growth accounting is designed to identify the contributions made by _____________________ to a country's rate of economic growth:

a.growth of population, and human capital.

b.growth in labour, capital and total factor productivity.

c.growth in capital, human capital and population.

d.growth in labour, human capital and capital.

One criticism of Rostow's theory of economic growth is that:

a.much available data contradicts his thesis about the take-off stage.

b.there is no explanation of why growth occurs after take-off.

c.his hypothesis of the stages of growth is difficult to test empirically.

d.all of the above are correct.

In growth accounting, total factor productivity refers to the:

a.

part of total output explained by labor added to the part of output explained by capital.

b.part of total output explained neither by labor and nor by capital.

c.

part of output explained by all factors but entrepreneurship.

d.

part of total output explained by changes in the total factor endowment.