EXAM ! Flashcards
conceptual definitions
how we’re defining something through language
operational definition
how we are going to measure the conceptual definition
reliability
determining the consistency of measurement
validity
determining accuracy of measurement
Can we have reliability without validity?
yes
probability sampling
each member of the population has an equal random probability of being chosen; can generalize
nonprobability sampling
the probability of any particular member of the population being chosen is unknown
convenient sampling
respondents are selected because they are convenient and accessible
judgement samples
Individuals are selected based on an experts opinion of who might be best to interview
quota sampling
attempts to ensure that demographic or interest are sufficiently represented in final sample
snowball sampling
current study participants are used to recruit new respondents
simple random sample
every member of the population has a known and equal chance of selection
proportionate stratified sampling
elements are selected from strata in exact proportion to their representation in the population
disproportionate stratified sampling
Sampling in which elements are selected from strata in different proportions from those that appear in the population
how to find sample size
DSS/(ATP x CS)
Nominal Data
categories must be mutually exclusive; numbers have no meaning and are only used for classification
ordinal data
classifies and ranks elements or scores; definite order to categories but intervals are not meaningful
interval data
posses all feature of nominal and ordinal; distance between points are nearly equivalent; no true zero
ratio data
possess all descriptive power; has a true zero point
example of nominal data
was the ad clicked on?
yes(1)
no(2)
example of ordinal data
rank soft drinks in order of preference
example of interval data
rate believability of commercial?
(calendar, temperature)
example of ratio data
why did you purchase a certain children’s cereal?
total:100
(height, weight)
I weigh 2x more than him
what is varience
the distribution of our data; a perfect data distribution is a bell curve
which is the greatest variance?
the one with the most dispersion across the scale
mean
average
median
middle
mode
most frequently occurring score
frequency
How many wave peaks pass a certain point per given time
what is the general rule for collecting data?
we always start with highest level of data