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Lecture 7

HLTB15H3 Lecture Notes - Lecture 7: Clinical Trial


Department
Health Studies
Course Code
HLTB15H3
Professor
Caroline Barakat
Lecture
7

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Lecture 7 Undertaking Research: Sampling Methods
The Concept of Sampling
Selecting a few from a bigger group
Advantages: saves financial and human resources
Disadvantages: estimation or prediction possibility of error!
Sampling in Qualitative Research
Saturation point that is, keep going as long as one keeps discovering new
information
Keep in mind saturation point is a subjective judgement
Sampling Terminology
Population / study sample (N)
Sample
Sample size (n)
Sampling design / strategy
Sampling unit / sampling element
Sampling frame
Sample statistics
Population parameters or population mean
Example:
Objective: to examine the incidence of childhood obesity in school-aged children
in Canada
Population / study sample (N) all children between the age of 5 and 11 years
Sample x number of children selected from the study sample
Sample size n = 2000
Sampling design / strategy random, stratified.....
Sampling unit / sampling element if a multi-stage sample, then could be schools, grades
selected, and individuals
Sampling frame a list of schools, grades, students
Sample statistics data related to who is obese or not
Population parameters or population mean can only be obtained if all children aged 5 -11
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