Uwaga: Tłumaczenia dodatkowych przykładów nie były weryfikowane przez naszych lektorów - mogą zawierać błędy.
The mail survey includes 5,000 families around the country, and yesterday's report covers responses gathered during the first three weeks of April.
The study was based on a mail survey in 1998 of 1,124 randomly selected doctors; 720 responded.
It was the first marketing research organization to specialize in mail surveys.
Effects of different monetary incentives on the return rate of a national mail survey of physicians.
The response rate was about 33 percent, which is considered typical of mail surveys.
Unlike with mail surveys, the interviewer has the opportunity to probe or ask follow up questions.
This study will seek to contact approximately 10,000 women to participate in a mail survey, a telephone interview, and a medical records review.
The board's consumer survey is a mail survey of 5,000 families.
Researchers have a bit more faith in mail surveys.
The report is based on an annual mail survey of 400,000 employers nationwide.