Why is a randomized, blinded experimental study best for establishing cause-effect relationships?
a. randomization balances out the effect of confounding factors
b. this study design establishes a time sequence of events
c. blinding can minimize bias
d. all of the above are reasons
why this is the preferred study design?

President franklin roosevelt most likely supported lawrence camp in the senate race against walter george and eugenes homage in 1938 because he

How did world war i contribute to the events leading up to world war ii? (a)germans wanted to expand their nation to regain territory in the soviet union. (b)britain and france wanted to force germany to make reparation payments. (c)germans hated the versailles treaty and supported hitler's actions to defy it. (d)the soviet union wanted to take over german territory in eastern europe.

A.passes laws and adopts budgets b.resolves disputes among members c.ensures legislation is applied fairly d.represents the eu globally a recent challenge to the european union created by a member state is a.migration b.free trade c.brexit d.the euro which is the most powerful position in the british government? a.the monarch b.the chancellor c.the prime minister d.the president which describes a constitutional monarchy? a.a monarchy in which a king or queen has all the power b.a monarchy in which the people elect the king or queen c.a representative government with a mostly ceremonial ruler d.a representative government with only one set of written laws