What statistical measure is necessary to interpret raw scores correctly?

To interpret raw scores correctly, the mean and standard deviation are essential statistical measures. The mean provides a measure of central tendency, offering insight into the average performance or score within a dataset. It allows for comparison among individual scores against the overall group. However, merely knowing the average score is not enough to understand the variability or spread of the data.

The standard deviation complements the mean by measuring the dispersion or spread of scores around the mean. It indicates how much individual scores deviate from the average score, which is crucial for understanding the distribution of the data. For instance, a low standard deviation suggests that the scores are clustered closely to the mean, while a high standard deviation indicates a wider spread of scores.

Together, the mean and standard deviation facilitate a comprehensive interpretation of raw scores, enabling one to assess not just the average but also the consistency of scores within a dataset. This understanding is vital in research and evaluation contexts where decision-making relies on accurate data interpretation.