briefly describe the community periodontal index and its authors
~ the purpose is to screen and monitor the periodontal status of
populations, the dentition is divided into sextants, in adults 20 years and older
10 index teeth are examined being the first and second molars and the
maxillar...
✓~ a small scale study done prior to a larger scale study *metaphor= a
test run*
what is a hypothesis?
✓~ a suggested explanation of a phenomenon
what is a null hypothesis?
✓~ a negatively stated hypothesis in an attempt to disprove or nullify it.
what is an alternative or research hypothesis?
✓~ an alternate way to explain a phenomenon stated in a positive term
list, but do not describe, the different types of samples.
, ✓~ random sample, stratified sample, systematic sample, convenience
sample, and judgmental or purposive sample.
describe a random sample
✓~ each member of the population has an equal chance of being
selected, most representative of a homogeneous population
describe a stratified sample
✓~ first dividing a population into subgroups and randomly sampling from
each subgroup. most representative of a heterogeneous population.
describe a systematic sample
✓~ every "nth" individual is selected to participate.
describe a convenience sample
✓~ selected based on availability or convenience
describe a judgemental or purposive sample
, ✓~ someone with knowledge the populations selects a sample that is
judged to be the most representative of the population, can result in a biased
sample
which is the most biased sample?
✓~ convenience sample
describe a double blind study
✓~ the participants as well as the examiner are unaware of group
assignment, this is the best way to avoid bias
describe validity
✓~ assuring that the study accurately represents the presence or
absence of the variable being measured
describe reliability
✓~ the consistency and stability at the data measured
list, but do not describe, the four scales of measurement
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