Hence, there is a weak positive
correlation between the performances of
the examinees on the test of the review
center and the board exam.
Thomas O. Maguire prepared a table of
values of rt corresponding to the ratio
These values of rt are given in Table H in
Another way of solving rt w/o
Ex. Number of Students Who Got
Items x and y Right and Wrong
, then look for
the corresponding value of rt .
Since there are no corresponding
table values for
, then the
reciprocal has to be computed.
Using Table H in Appendix A,
3.111 is found between 3.060
and 3.153 and the value of rt is
-0.42. This means that item x is
negatively correlated with item
Hence, many of the students
who are correct in item y are
wrong in item x, and vice versa.
Among the following problems that can be
answered using tetrachoric correlation
coefficient include the ff.:
Is the personality (introvert/extrovert)
related to success or failure in a job that
requires contact with people?
Is motivation (high/low) related to the
development of scientific literacy?
"Mathematicians are like Frenchmen:
Whatever you say to them, they translate it
into their own language, and forthwith it
means something entirely different."
Johann Wolfgang von Goethe (1749 – 1832)