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Roseville Parks and Re(:re ation Survey ................. a birthday, calling back when the eligible adult is not available (this increases costs slightly, but ensures a representative sample). If we use the voter list, we would mail the survey to or ask to speak to the specific named voter. Choosing -the Sample Size It should be noted that telephone surveys tend to have smaller sample sizes while mailed surveys tend to have larger sample sizes. This is due to the costs associated with each administration method as a telephone survey with a small sample costs about as much as a mailed survey with a larger sample. The relationship between sample size and precision of estimates (the 95% confidence interval or margin Margin of Error of error) is shown in the adjacent table. The table Sample Size (95%Confidence interval) can be interpreted as follows: If 60% of 400 100 ±9.8% Roseville residents reported that the Parks and 150 ±8.0% Recreation Department provides "excellent" service, 400 +-4.9% we can be confident that, had we gotten ratings 600 +4.0% from all residents, somewhere between 55% and 800 ±3.5% 65% would have responded that the Department 1,000 ±3.1% provides excellent service. 1,500 ±2.5% We have provided cost estimates for a final sample size of 400 completed surveys. (For a mailed survey, this is an approximate number of completed surveys; we estimate the likely response rate and choose the number of survey recipients appropriately. For a telephone survey, we can exhaust replicates of sample until a precise number of interviews is completed.) We are happy to provide cost estimates for other sample sizes, if desired. 0 0 Task 3.,, Developing the Questionnaire NRC and GreenPlay have completed hundreds of survey projects and can bring our considerable experience to managing the process of developing the survey instrument with RPR. We have the survey process expertise and have helped many jurisdictions develop surveys that inform performance measurement, support policy planning and determine unmet community needs. But, whatever our skills, your staff and citizen group and other stakeholders know best what decisions RPR is facing and what guidance they need from the community. We always will be prepared with content and wording suggestions, but will listen closely and help you define your specific needs. NRC and GreenPlay will work with you to develop and prioritize questions and will work to balance the length of survey (and burden on respondents) with your need for the data each question represents. Page 8