Which score has a mean of 100 and a standard deviation of 15?

The correct answer is that Deviation IQ scores have a mean of 100 and a standard deviation of 15. This scoring system is widely used in intelligence testing to measure an individual's performance relative to the average performance of the population. The mean score of 100 indicates that it is the average score, while the standard deviation of 15 provides insight into the variability of test scores around the mean.

This means that approximately 68% of the population will score between 85 and 115, which are one standard deviation below and above the mean, respectively. The structure of Deviation IQ scores allows for a standardized way of interpreting intelligence across different tests and populations, facilitating comparisons.

Understanding the characteristics of other score types can help clarify this concept. For instance, Z-scores measure how many standard deviations a particular score is from the mean but do not have defined means and standard deviations of 100 and 15. T-scores are also standardized but typically have a mean of 50 and a standard deviation of 10. Lastly, Stanines are a more simplistic scoring system divided into nine intervals, with a mean of 5 and a variance that is not directly comparable to the 100/15 structure.