SAVE 50%
Popular Searches
About Us
Apps - Apple
Apps - Android
Autism
Awards - Super Duper
Best Sellers
Clearance SAVE 75%
eCatalog
eGIFT Card
Fun Decks
Product by Price
Product Search
RTI Programs
Tests SAVE $100
What's New
Wish List
Win $50
FREE Stuff
Age Calculator
Apps
CEUs
New Product Review
Response Analyzer
SLP Case History Form
Free Handy Handouts
Information
Autism
Bilingual
Contact Us
Customer Help
International Orders
Parents
Occupational Therapy
Students
Super Duper Jobs
Tour the Castle
Try It Out!
Our Customer Helpers
Se habla Español
Nous parlons Français

We accept
ONLINE PURCHASE ORDERS
Assessment FAQs
What is the difference between norm-and criterion-referenced?
  • A norm-referenced test compares a child's score to a group of typically developing children of the same age across the country.
  • A criterion-referenced test measures mastery of a specific set of skills based on the child's age or grade level.
What is meant by reliable and valid?
  • A reliable assessment is one that provides the same results with repeated administrations. Typically, you should be able to administer a test on two different days and obtain consistent scores.
  • A valid test is one that measures what it is supposed to measure and also gives the same results as a similar instrument. For example, if you give the CAAP® and the SPAT-D II and you should see the same error patterns.
Explain standard scores, percentile ranks, and age equivalents.
  • A standard score is a score based upon the standard deviation of the test population. Typically, a standard score will have an average or mean of 100 and a standard deviation of 15. Thus, a child receiving an average score on a test would fall one standard deviation above or below the mean, and his/her score would range between 85 and 115. In most school districts, a child will qualify for services if his/her scores are 1 1/2 to 2 standard deviations below the mean.
  • A percentile rank is a converted standard score. It refers to the percentage of children who fall at or below a specific score. For example, a percentile rank of 90 means that the child scored better than 89% of the test population.
  • An age-equivalent score indicates that the child's performance on the test may be typical of that particular age group. For example, a child may be 4 years old, but receives an age equivalent of 3 1/2 based on his/her responses to the test.
What is a confidence interval?
  • A confidence interval is the range of a child's test score. For example, a child may receive a standard score of 85 with a confidence interval of +8 or -8. Upon repeated administration, the child's score may vary from 77-93.
Back To Main FAQs Page