Final answer:
A score on an intelligence test with a percentile rank of .30 indicates that 30% of the population score below a given score.
Step-by-step explanation:
The score on an intelligence test with a percentile rank of .30 indicates that 30% of the population score below a given score. So the correct answer is C. 30% of the population score below a given score.
The percentile rank represents the percentage of scores that fall below a given score. In this case, a percentile rank of .30 means that 30% of the population scored below the given score. This can be helpful in understanding how an individual's score compares to others in the population.
For example, if a student's score on an intelligence test has a percentile rank of .30, it means that their score is higher than 30% of the population and lower than 70% of the population.