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A guide for gathering data

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Learning Objectives Sampling Methods Random Sampling Systematic Sampling Stratified Sampling Cluster Sampling Convenience Sampling Sampling Videos Sampling Relationships Example 1: Identifying Sampling Methods Example 2: Utilizing Sampling Methods References 2Sarah DiCalogero - Statistical Sampling

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Define the five basic sampling methods Random Systematic Stratified Cluster Convenience Identify sampling methods in an example Use sampling methods to choose data 3Sarah DiCalogero - Statistical Sampling

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The pick a name out of the hat technique Random number table Random number generator Hawkes and Marsh (2004) 4Sarah DiCalogero - Statistical Sampling

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All data is sequentially numbered Every nth piece of data is chosen Hawkes and Marsh (2004) 5Sarah DiCalogero - Statistical Sampling

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Data is divided into subgroups (strata) Strata are based specific characteristic Age Education level Etc. Use random sampling within each strata Hawkes and Marsh (2004) 6Sarah DiCalogero - Statistical Sampling

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Data is divided into clusters Usually geographic Random sampling used to choose clusters All data used from selected clusters Hawkes and Marsh (2004) 7Sarah DiCalogero - Statistical Sampling

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Data is chosen based on convenience BE WARY OF BIAS! Hawkes and Marsh (2004) 8Sarah DiCalogero - Statistical Sampling

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Random and Stratified Random Sampling Random and Stratified Random Sampling (YouTube, 2009) Cluster and Systematic Sampling Cluster and Systematic Sampling (YouTube, 2009) 9Sarah DiCalogero - Statistical Sampling

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Random Sampling Cluster Sampling Stratified Sampling 10Sarah DiCalogero - Statistical Sampling

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In a class of 18 students, 6 are chosen for an assignment Sampling TypeExample RandomPull 6 names out of a hat SystematicSelecting every 3 rd student StratifiedDivide the class into 2 equal age groups. Randomly choose 3 from each group ClusterDivide the class into 6 groups of 3 students each. Randomly choose 2 groups ConvenienceTake the 6 students closest to the teacher 11Sarah DiCalogero - Statistical Sampling

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Determine average student age Sample of 10 students Ages of 50 statistics students 182142321718 1922 2524232518 19 2021 192922172120 243618 1719 23252119212427 21221918252324171920 12Sarah DiCalogero - Statistical Sampling

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Random number generator Data Point Location Corresponding Data Value 3525 4817 3719 1425 4724 432 3319 3525 3423 342 Mean25.1 13Sarah DiCalogero - Statistical Sampling

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Take every data point Data Point Location Corresponding Data Value 517 1022 1518 2021 2521 3018 3521 4027 4523 5020 Mean20.8 14Sarah DiCalogero - Statistical Sampling

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Take the first 10 data points Data Point Location Corresponding Data Value 1 18 2 21 3 42 4 32 5 17 6 18 7 8 9 19 10 22 Mean22.5 15Sarah DiCalogero - Statistical Sampling

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Hawkes, J., & Marsh, W. (2004). Discovering Statistics (2nd ed.). Charleston, SC: Hawkes Publishing Inc.. YouTube. (2009). Random Sample. Retrieved from http://www.youtube.com/watch?v=xh4zxC1Opi A&feature=related http://www.youtube.com/watch?v=xh4zxC1Opi A&feature=related YouTube. (2009). Types of Random. Retrieved from http://www.youtube.com/watch?v=wUwH7Slfg 9E&feature=related http://www.youtube.com/watch?v=wUwH7Slfg 9E&feature=related 17Sarah DiCalogero - Statistical Sampling

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