Statistics Flashcards
what are the two categories of variables
numerical (qualitative)
categorical (quantitative)
what are the two categories of categorical data
nominal (e.g eye colour, gender)
ordinal (e.g police ranking, exam scores)
what are the two categories of numerical data
discrete (whole numbers)
continuous (decimal points)
what is mean
a measure of location
average
(sensitive to outliers)
what is median
a measure of location
middle value of an ordered list
(not sensitive to outliers)
what is range
a measure of spread
maximum value - minimum value
what is standard deviation
a measure of spread
measure of the amount of variation from the mean (average)
larger the standard deviation suggests the larger the spread from the average
what is an interquartile range
a measure of spread
measure of dispersion in skew data
(refers to the middle 50% of the data)
what does normality test P>0.05 indicate
what tests should you do for data with this kind of P value
there is evidence to suggest that the data is normally distrubuted
mean
standard deviation
what does normality test P<0.05 indicate
what test should you do
that there is evidence to suggest that the data is not normally distrubuted
median
interquartile range
if doing a numerical hypothesis test and the data is paired and normally distrubuted what hypothesis test should you do
paired t test
if doing a numerical hypothesis test and the data is paired and NOT normally distrubuted, what hypothesis test should you do?
wilcoxin test
if doing a numerical hypothesis test and the data is independent and normally distrubuted, what hypothesis test should you do
2 sample t test
if doing a numerical hypothesis test and the data is independent and NOT normally distrubuted , what test should you do?
mann whitney test
if the data is categorical what hypothesis test should you do
a chi- squared test
