NCEDL Multi-State Study of Pre-Kindergarten
Sampling Plan
19
preliminary States selected to meet threshold, screening for
states
numbers and percentage of children served.
States selected based on diversity in
Teacher credentials
6 states Location of program (in vs. out of school
Intensity (length of day/year)
Geography
Local programs selected through stratified
40 sites in each random sampling to maximize variation in:
state Teacher credentials
Intensity (length of day)
1 classrooms Classrooms selected using stratified random
per site sampling to maximize variation in:
Teacher credentials
Location of program (in vs. out of school)
Intensity (length of day)
4 children per Children selected randomly
classroom Half girls, half boys