When a given research finding is believed to have less than a ____ in 100 probability of occurring by chance, it is usually described as being statistically significant

Explain why it is difficult for epidemiologists to get an accurate picture of the number of cases of dementia, and the types of dementia, in the U.S. population

Answer:

Which of the following is the best definition of "dependent variable"?

It is the measured variable that may change depending upon manipulation of an experimental variable. It is any unmeasured variable that is not controlled within the context of the experiment. It is the variable that is intentionally manipulated by the researcher. It is one of the external variables that cannot be controlled by the researcher.