What type of measures are used to study groups or individuals without their knowledge?

Repeated cross-sectional design experiments are also known as:

A researcher obtains a list of all prisons in the U.S. She draws a random sample of 75 of the prisons on this list. She then obtains a list of all inmates from the warden at each of the 75 prisons and interviews a random sample of 30 inmates at each prison. This is a:

A study can still be said to utilize a true experiment if the experimental and comparison groups are not randomly chosen.

To study organized crime

Reliability exists when measurements are consistent.

In order to determine the relationship between weather and crime

An ordinal level measure can accommodate the same mathematical functions as a ratio level measure.

Which of the following is a non-probability sampling method?

A quota sample is equivalent to what type of a probability sample?