2.1 Flashcards
format for thesis questions
what is the relationship between xyz, how is xyz affected by abc
analyzing thesis question
what are main variables, statistically measurable, enough accessible data, social relevance
population
group being studied
sample
selection of individuals from population
inference
prediction about population based on sample
cross sectional study
different groups at same time, specific timeframe, wide range of individuals
longitudinal study
small group over a long period of time
time series data
data accumulated over a long period of time
qualitative data
not measurable numerically, categorical, multiple choice answers
qualitative data
bar graph circle graph pictographs
quantitative data
numerical, discrete or continuous
quantitative discrete
bar, histogram (over long range)
quantitative continuous
box and whisker, histogram
simple random sampling
fast/easy, may not be representative of pop, e.g. pick names out of hat
systematic random sampling
random starting point, then select every nth object, n is sample interval = pop size/sample size, population spread
stratified random sampling
pop broken up into groups, then random proportional sample from each
cluster random sampling
population broken up into groups, then random sample of groups (all objects)
multi stage random sampling
population broken up into groups, then random sample of groups (random sample of objects)
destructive random sampling
samples used up by testing process, usually for quality control
factors that affect reliability
variability of pop, sampling method, degree of precision
non random sampling
convenience sampling, volunteers
types of questions
open, closed
open questions
opinion/list, sometimes difficult to interpret
closed
information, checklist, ranking, rating