Wide Range Achievement Test Wide Range Achievement Standardization and Norming 3

Question 1

What does 'stratified sampling' mean in the context of WRAT norming?

Accepted Answer

Selecting participants to match population proportions on key demographic variables

Answer

Stratified sampling ensures the normative sample mirrors the US population on key variables like age, sex, race, and region.

Question 2

Which WRAT score type would be most useful when comparing a student's performance across different academic subject areas?

Accepted Answer

Standard scores

Answer

Standard scores allow direct comparison across WRAT subtests because they use the same scale (mean 100, SD 15).

Question 3

A WRAT standard score of 130 would fall approximately how many standard deviations above the mean?

Accepted Answer

2

Answer

A score of 130 is 30 points above the mean of 100; with an SD of 15, that equals 2 standard deviations above average.

Question 4

What is the approximate percentile rank corresponding to a WRAT standard score of 100?

Accepted Answer

50th percentile

Answer

A standard score of 100 corresponds to the 50th percentile, meaning average performance relative to the normative group.

Question 5

Which factor could most threaten the validity of WRAT norms over time?

Accepted Answer

Demographic shifts in the US population making old norms unrepresentative

Answer

As the US population changes demographically, older normative data may no longer accurately represent current performance levels.

Wide Range Achievement Test Practice Test