Probability Sampling and Nonprobability Sampling

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Assignment110.docx

Assignment:  Based on the material on sampling in the textbook and from the video, answer the following questions

1)  You want to survey professors at CCP about their online courses. You want to be sure to include professors from each department, even the very small ones.   

A.  What sampling method would you use? 

B.  Is this an example of probability sampling or nonprobability sampling?

2)  You have a population of 100 third grade children from a local school district, from which you want to create a sample of 25 students. You write each child’s name on a list, and each child is assigned a number from 1 to 100. Then the numbers 1 to 100 are written on separate pieces of paper and shuffled. Finally, you pick 25 slip of paper and the numbers on the paper determine the 25 participants. 

A.  What sampling method is this?

B.  Is this an example of probability sampling or nonprobability sampling?

3)  You are interested in sampling CCP students who sell illegal drugs to supplement their income. You would ultimately like a sample of 50 students.  You have identified 20 students who have reported selling drugs.  You are hoping that they know other students who sell drugs who they can recommend for your study. 

A.  What sampling method could you use to build up this sample? 

B.  Is this an example of probability sampling or nonprobability sampling?

4)  You are studying how prisons safeguarded prisoners in maximum security prisons during the COVID-19 outbreak. You group maximum-security prisons by state, randomly selects 10 states, and, from those 10, selects three prisons. You include all the inmates in those three prisons in your sample. 

A.  What sampling method is this?  

B.  Is this an example of probability sampling or nonprobability sampling?

5)  You are studying the achievement levels in science of fifth grades in Philadelphia's …