Terms
Probability Sampling
Nonprobability Sampling
Article
Miscellaneous
100
What is the definition of sampling?
the process of selecting units (e.g., people, organizations) from a population of interest so that by studying the sample we may fairly generalize our results back to the population from which they were chosen
100
What is the definition of probability sampling?
all elements of the survey population have an equal chance or probability of being selected
100
What is nonprobability sampling?
Unknown probability of selection They are available, accessible, or have characteristics in which the researcher is interested Cannot claim representative of population
100
Which 2 sampling techniques were used in this article?
Simple Random Sampling & Purposive Sampling
100
You have a cup of hershey kisses and choose the 8 on top that are most easily accessible. Which sampling procedure does this demonstrate?
Convenience (nonprobability) sampling
200
What is the definition of sample?
Subset of eligible participants Group of elements (i.e. persons),or a single element, from which data are or have been obtained
200
What are the steps in probability sampling?
1. Define the target population 2. Identify the survey population/sampling frame 3. Identify sample size 4. Select method of sampling 5. Select sample
200
Why use a nonprobability sample?
- No sampling frame available - Limited resources - When the integrity of a probability sample is compromised (with acknowledgement) - Sometimes desirable (certain qualitative studies)
200
What is the sampling frame?
list of 18 rural and 76 urban government- aided primary schools in Mbale District, Uganda
200
You are handed a cup of hershey kisses, all silver except for 3 purple. You choose the 3 purple. Which sampling technique does this demonstrate?
Purposive (nonprobability) sampling
300
What is the definition of a sampling frame?
LIST of all elements (persons) from which the sample is to be drawn
300
What are the 4 probability sampling procedures?
1. Simple random sampling 2. Systematic Sampling 3. Stratified Random Sampling 4. Cluster or Area Sampling
300
What are 4 nonprobability sampling procedures?
1. Convenience 2. Purposive 3. Snowball 4. Quota
300
What was the sample size?
4 Ugandan primary schools
300
Jayne is a subject in our research study regarding skin cancer. Her friend Molly has skin cancer too. So Jayne refers Molly to the study. This is an example of which sampling procedure?
Snowball (nonprobability)
400
What is the definition of a sampling unit?
element or set of elements considered to be part of the sample; may be an individual, organization, or geographical area
400
What is systematic sampling?
Uses list in random order; Select at a constant interval (N/n) after random start
400
Describe one of the nonprobability sampling procedures.
- Convenience: includes accessible subjects; forgoes representativeness - Purposive: purposefully select individuals who they believe are good sources of information - Snowball: includes those identified by / referred by initial subjects - Quota: includes those chosen in approximate proportion to the population traits they represent
400
How was data collected?
Using focus group discussions and structured observations
400
This interval, starting at 2, is an example of which technique? 2, 6, 10, 14, 18...
Systematic Sampling
500
What are Type I and Type II Errors?
Type I Error: When the researcher makes the decision to reject the null hypothesis but the null hypothesis is actually true. Type II Error: When the researcher makes the decision to accept the null hypothesis when the null hypothesis is actually false.
500
You have a population of 60 individuals: 30 Caucasian, 20 African American, and 10 Hispanic. You need 12 so you choose to use 6 Caucasian, 4 African American, and 2 Hispanic. Which type of sampling technique does this demonstrate?
Stratified, Proportional Random Sample
500
Describe 2 of the nonprobability sampling procedures.
- Convenience: includes accessible subjects; forgoes representativeness - Purposive: purposefully select individuals who they believe are good sources of information - Snowball: includes those identified by / referred by initial subjects - Quota: includes those chosen in approximate proportion to the population traits they represent
500
Why was purposive sampling used?
"Purposive sampling was adopted for the FGDs as is customary, in order to elicit a broad range of views (Babbie 1990). While a typical sample is desirable, it was assumed that the head teachers’ guidance on participant selection was appropriate."
500
A common method of selection for simple random sampling is a
Random Number Table
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