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Civic Report No. 38 June 2003
Vouchers for Special Education Students: An Evaluation of Florida’s McKay Scholarship Program
Appendix C: Survey Methodology
Interviews were conducted by Taylor Nelson Sofres Intersearch using a Computer Assisted Telephone (CATI) system. Professional survey interviewers trained in standard protocols for administering survey instruments conduct all surveys with parents/guardians of Current and Former students of the McKay school. Interviewers assigned to this project participated in a special training conducted by senior project staff.
Prior to the start of interviewing an advance letter was sent to all sample households on Florida Department Of Education stationery. This letter was mailed one week prior to full scale interviewing.
A pretest of the questionnaires and protocols was conducted on March 18, 2003.
Each sample piece received up to 6 calls in order to complete an interview. The female parent or guardian was always requested at the beginning of the interview
Current Survey
A total of 600 interviews were conducted with respondents whose child is currently enrolled in a McKay school. Of these 600 interviews, 19 originated from the Former sample list. Full-scale data collection was conducted March 20, 2003 to April 6, 2003.
The average length of interview was 14 minutes and the incidence of reaching a qualified respondent was 94%
The confidence interval (alpha level=.05) assumes a base of all respondents (not those asked a specific question where all respondents were asked the question). They are calculated at the maximum width (i.e., assuming a p=.5). For current participants the margin of error is +/- 3.9%.
Former Survey
A total of 215 interviews were conducted with respondents whose child no longer attends a McKay School. Of these interviews 61 originated from the Current sample list. Full-scale data collection was conducted March 20, 2003 to April 6, 2003.
The average length of interview was 15 minutes and the incidence of reaching a qualified respondent was 82%.
The confidence interval (alpha level=.05) assumes a base of all respondents (not those asked a specific question where all respondents were asked the question). They are calculated at the maximum width (i.e., assuming a p=.5). For the former participants in the program, the maximum margin of error is +/- 6%.
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