Other Effective Sampling Methods. Definitions Frame = A list of all the individuals within the population.

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Presentation transcript:

Other Effective Sampling Methods

Definitions Frame = A list of all the individuals within the population

Definitions Stratified Sample = Obtained by separating the population into nonoverlapping groups called strata and then obtaining a simple random sample from each stratum. The individuals within each stratum should be homogeneous (or similar) in some way. Need a frame Example: Democrats, Republicans, Independent

Definitions Systematic Sample = is obtained by selecting every kth individual from the population. The first individual selected corresponds to a random number between 1 and k. Doesn’t require a frame

Steps in Systematic Sampling 1.If possible, approximate the population size, N. 2.Determine the sample size desired, n. 3.Compute N/n and round down to the nearest integer. This value is k. 4.Randomly select a number between 1 and k. Call this number p. 5.The sample will consist of the following individuals: p, p+k, p+2k, …, p+(n-1)k

Definitions Cluster Sample = is obtained by selecting all individuals within a randomly selected collection or group of individuals. Don’t need a complete frame just a frame of the groupings. homogeneous = similar heterogeneous = dissimilar

Definitions Convenience Sample = a sample in which the individuals are easily obtained Most Popular Type: self-selected : individuals themselves decide to participate (voluntary response samples)

1. Identify the type of sampling used (Similar to p.36 #11-24) An instructor walks into a classroom and asks his students whether they are for or against making marijuana legal.

2. Identify the type of sampling used (Similar to p.36 #11-24) The instructor randomly picks the number 7 and randomly picks the number 5. He then takes a sample of students coming out of the library starting with the 7 th student and every 5 th one after that.

3. Identify the type of sampling used (Similar to p.36 #11-24) Administration randomly picks 3 classrooms during the 8:00 slot on MWF and administers a survey to everyone in those classrooms

4. Identify the type of sampling used (Similar to p.36 #11-24) Administration splits the students at a college into two groups (Men and Women) and randomly picks from within each group.

5. Identify the type of sampling used (Similar to p.36 #11-24) An instructor randomly pick 40 students from everyone on the campus to see if they think the government captured a space alien in Cowley County.

Naval Craft? Hmmmm, how much are you selling London Bridge for? (2012)

6. Systematic Sample There are a total of 3300 individuals in a town. A company wishes to conduct a systematic sample. Determine k if the sample size is 70.

7. Systematic Sample A survey is to be conducted at a company. The company has 4000 employees and wants to conduct a systematic sample of size 35 to determine how many think the CEO is an alien. (a)What is k? (b)Suppose that 3 is randomly picked, then the individuals in your survey will be: ____, ____, …, ____