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