In a _____ sample,each person in the population theoretically has an equal chance of being chosen.

A) biased
B) judgment
C) convenience
D) random

A random sample ensures that each person in the population has an equal chance of being chosen, thus eliminating any potential biases and providing a representative sample of the population. A biased sample occurs when certain groups are overrepresented or underrepresented, skewing the results. A judgment sample involves the researcher's personal judgment in selecting participants, which could also introduce biases. A convenience sample is one in which participants are chosen based on their easy accessibility, which can also lead to biased results.