1. Describe the major advantages and disadvantages of using group-administered, multiple-skill achievement tests. 2. A new student is assessed in September using the WRAT4. Her achievement test scores...

1. Describe the major advantages and disadvantages of using group-administered, multiple-skill achievement tests.

2. A new student is assessed in September using the WRAT4. Her achievement test scores (using the PIAT3NU) are forwarded from her previous school and place her in the 90th percentile overall. However, the latest assessment places her only in the 77th percentile. Give three possible explanations for this discrepancy.