Flashcards in 9.12 EBDM Basic Statistics Deck (31):
Measure that pertains to the population, almost always unobservable. Characteristic of a population. Describes the entire population
Characteristic of a sample (measure based on a sample). We can use this to estimate a population parameter.
if there is a skew and the peak is to the right and the tail is to the left, it is a _____ skew
if there is a skew and the peak is to the left and the tail is to the right, it is a _____ skew
mean, median, and mode are measures of _______
range, inter-quartile range, variance, standard deviation are measures of ________
how far the values are away from the mean. A larger _____ means more uncertainty
square root of variance is _____
repeated measurements give the same/similar results. is this reliability or validity?
when a tool measures what it is supposed to, the "truth" it is ______.
concept of validity
what is Intra-rater reliability
measure once by one person, measure again by same person and it is around the same
what is inter-rater reliability?
measure once by one person, measure again by another person - same/similar results
measure today, measure tomorrow, same/similar results
do reliable results mean the data is valid?
does a measure have to be reliable to be valid?
there are two TYPES of measurement: what are they?
categorical and continuous
there are four LEVELS of measurement, what are they?
nominal, ordinal, interval, ratio
a nominal level of measurement is ________ (categorical or continuous?). What does it measure?
measures categories that have no order (occupation, gender, eye color, blood type)
an ordinal level of measurement is _______ (categorical or continuous?). What does it measure?
measures categories that have an order/direction (pain - poor, excellent, OK.... size small, medium, large)
an interval level of measurement is _______ (categorical or continuous?) what does it measure?
either categorical or continuous
data on a scale with an arbitrary 0 point and quantitative differences between two measurements (temperature, etc)
in interval levels of measurement, is a ratio meaningful? is a range?
a ratio is NOT meaningful and a range is.
a ratio level of measurement is _________ (categorical or continuous?) what does it measure?
either categorical or continuous.
measures something with a true/absolute zero point where ratio between two is meaningful (blood pressure, weight, cholesterol)
what level of measurement would you use for something that you think of as "twice as much, three times as much"
ratio level of measurement
on a scatterplot, you can see _______ between two variables
the LINEAR relationship between two variables on a scatterplot is called what?
the correlation coefficient
what are the two extremes of the correlation coefficient for a scatterplot?
-1 to 1
if there is no significant correlation coefficient for a scatterplot does that mean there is no correlation?
NO, it could be a non-linear correlation
___________ is the technique to study if a dependent variable changes with an independent variable
linear regression analysis can _______ dependent variable using the independent variable
in ____________ analysis, one postulates the statistical model that two variables, X and Y are related by a straight line