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Note: In the factorial design, the distributions of gender, age, and race were not statistically significantly different between survey lengths or notification types.
Two different incentive amounts ($3 and $5) and two survey lengths (33 questions--or 10 pages--and 61 questions--or 16 pages) were tested with breast, prostate and colon cancer patients.
This finding, coupled with the potential of reduced accuracy of the measurement process brought about through shortening a questionnaire [ 8], suggests that future researchers hoping to increase participation in their mail survey-based investigations should be cautious in their effort to reduce survey lengths.
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Including content from the other strands in these national standards would have necessitated a survey length that would have been developmentally inappropriate for young children.
While this ability to capture multiple choices is generally seen as an advantage, there is a certain amount of unease about survey length.
Prior to the data collection, a pilot study was conducted to test the effectiveness of the survey questions, check the logic, flow and question wording, and the survey length.
The results provide researchers with guidelines on the degree to which best worst designs can be divided among several respondents to reduce survey length and respondent load, depending on the research question pursued.
P-value for survey length-by-age interaction = 0.001.
No significant interaction was found between survey length and pre-notification type (p = 0.25), however, there was a significant interaction between survey length and age (p = 0.001).
Questions focused on question clarity, survey length and whether responders felt the survey to be neutral.
Survey length and presentation are discussed in more detail in subsequent sections.
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