chi square Flashcards
a test that measures how a model compares to actual observed data.
chi-square (x2) statistic
Chi-square tests are often used to
test hypotheses.
compares the size of any discrepancies between the expected results and the actual results, given the size of the sample and the number of variables in the relationship.
chi-square statistic
Values must exceed atleast
5.
seeks to develop a statistical expression (the model) that predicts the behavior of a dependent variable on the basis of knowledge of one or more independent variables.
statistical modeling,
statistical modeling, which seeks to develop a statistical expression (the model) that predicts the behavior of a _____ variable on the basis of knowledge of one or more _____ variables.
dependent; independent
chi square is always Always two-tailed
true
a data table that compares two variables.
contingency table
in contingency table,one data set is populated in ____ (p), while the other data set is
populated in ___ (q).
rows; columns
Values of the cells where the rows and columns intersect can suggest
whether or not the two sets are correlated.
represents two
classifications of a set of counts or frequencies.
two by two or fourfold contingency table
number of times a particular event is occurring actually when an experiment is conducted in the real world
Observed Frequency
number of times a particular event is expected to occur or claimed to occur. This figure is computed using a simple formula to predict the outcomes of a specific event using known data.
Expected Frequency
formula for df
df = (p-1)(q-1) = 1
If the calculated x2 value is smaller than the p value, t
here is NO observable difference and therefore the null hypothesis has failed to be rejected
If the calculated x2 value is larger than the p value,
THERE IS AN observable difference and therefore the null hypothesis is rejected and the alternative hypothesis is accepted
