confidence intervals

Also, on the results of Woodcock Reading Mastery I only received grade equivalent scores, doesn’t the Woodcock have standard scores or percentile ranks as well?

There is always some error in measurement. The confidence interval just tells you the range which the “true” score can be found in. It isn’t worth worrying about frankly.

Beth

Beth’s right — that range means that given that no test is perfect, the “actual” ability should fall somewhere in that range. It’s part of every score. As far as the Reading Mastery — percentiles and standard scores should also be provided. THey’re much more meaningful (and comparable for progress, etc.) than grade levels.