Quick Start Expectations 1.Fill in planner and HWRS HW: p #5, 7, 9, Get a signature on HWRS 3.On desk: calculator, LabSheet packet, Toolkit 4.Warm Up: Describe the population, the sampling plan, and the sample. Warm-Up Population = middle school students Sampling plan = 8 th grade students keep records of the time they spend on the phone each day for a week Sample = 8 th grade class conducting the plan Describe the population, the sampling plan, and the sample. LS pkt Convenience Sampling People are easy to locate; plan is easy to implement. You might not get a sample that represents the entire population. Advantages: Disadvantages: add to toolkit Systematic Sampling A better variety of students will be sampled than a Convenience Survey. You might not get a sample that represents the entire population. Advantages: Disadvantages: add to toolkit Voluntary Response Sampling This type of sampling gets responses easily. You might not get a sample that represents the entire population. Disadvantages: Advantages: add to toolkit Random Sampling This type of sampling usually gets the best variety and represents the whole population best. It is usually more complicated to arrange, and locating the people for their responses can be challenging. Advantages: Disadvantages: add to toolkit Convenience Sampling Systematic Sampling Voluntary Response Sampling Random Sampling Agree, because i. Stratified sample not quite a random sample ii. Yes, it represents the student body, assuming the teachers choose the students randomly. iii. Possibly unintended bias if teacher asks questions? How could this be avoided?