Chapter 6 Flashcards
single item measure
item intended to be analyzed by itself (gender, age)
multi-item
a set of items that all assess the same construct
constructs
an idea or theory containing various conceptual elements, several measurements needed
survey
a type of descriptive research that may utilize questionnaires, interviews, or observational techniques
demographic
describe patterns of basic life events and experiences such as birth, marriage, divorce
epidemioligcal
describes the occurence of disease and death
frequency of distribution
a table/graph that summarizes raw data by showing the number of scores that fall within each of several categories
types of frequency distribtuon
simple, grouped, histogram
bar graph
x-axis is nominal, bars do not touch
histogram
variable on the x-axis is measured on a ratio/interval scale, bars touch
skew
a measure of the asymmetry of a distribution
positive skew
more low scores than high
negative skew
more high scores than low
mean
average
median
midpoint
mode
most commonly occurring
central tendecny
mean, median, mode
parametric
assumes a specfic distribution
non parametric
does not assume a specific distribution
normally distributed data
because of symmetry, means, and sd
non-normal data
other measure are more accurate
measures of variability
sd, iqr, variance
standard deviation
the average deviation from the mean
IQR
difference between 3rd and 1st quartile
normal distribution
68% of scores fall in a range defined by + or - 1 SD from the mean
y-axis of frequency distributions
something to do with the frequency of observations
variance and sd fo with
the mean
IQR goes with
median
