Which Statistical Procedure is Appropriate?
Variables
Major assumptions
Test
SPSS procedure
Example research
question
Comments
Tests that ask whether a single variable is distributed as hypothesized
One categorical
variable with 2 levels
None
Binomial
test
Nonparametric tests
Binomial
Are 50% of all students
are female?
Determines if each category
occurs as often as expected
One categorical
variable
None
"Oneway"
chisquare
Nonparametric tests
Chisquare
Are all eye colors are
equally common?
Determines if each category
occurs as often as expected
One numerical
variable
None
Kolmogorov
Smirnov
test
Nonparametric tests
1Sample KS
Do IQ scores have a
normal distribution?
Overly sensitive to sample size;
normal probability plot is
preferable
One numerical
variable
None
Normal
probability
plot
Graph
QQ
Do IQ scores have a
normal distribution?
Plot will approximate a straight
line if distribution is normal
One numerical
variable
Variable is normally
distributed
Onesample
ttest
Compare Means
OneSample T Test
Do IQ scores have a
mean of 100?
Determines if population mean is
equal to a "test value" specified a
priori
Tests that ask whether two variables are related
Two categorical
variables
At least 80% of the
"expected values" are
5 or more
"Twoway"
chisquare
Descriptive Statistics
Crosstabs
Are eye color and hair
color related?
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 Spring '04
 SHERMAN
 Normal Distribution, numerical variables Variables, numerical DV

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