Ken,  It seems that there may be an Internet bias as well (more affluent  and educated households are on-line).
One solution: develop a control group.
Arm-twist clerical  employees of the School to fill out the questionnaire and also ask them to provide the questionnaire to their friends  and families.
Vince

Team 3
Ken, It seems that there may be an Internet bias as well (more affluent and educated households are on-line).
One solution: develop a control group.
Arm-twist clerical employees of the School to fill out the questionnaire and also ask them to provide the questionnaire to their friends and families.
Vince
ken households line solution arm twist families vince employees school questionnaire internet bias affluent develop control group ask provide friends