7.
Hence, there is a weak positive
correlation between the performances of
the examinees on the test of the review
center and the board exam.
8.
Thomas O. Maguire prepared a table of
values of rt corresponding to the ratio
or
.
These values of rt are given in Table H in
Appendix A.
Another way of solving rt w/o
trigonometric values
9.
X
0
1
0
14
9
1
8
16
Y
Ex. Number of Students Who Got
Items x and y Right and Wrong
10.
Compute for
, then look for
the corresponding value of rt .
=
= 0.321
11.
Since there are no corresponding
table values for
, then the
reciprocal has to be computed.
Thus,
=
= 3.111
12.
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
y.
Hence, many of the students
who are correct in item y are
wrong in item x, and vice versa.
14.
Among the following problems that can be
answered using tetrachoric correlation
coefficient include the ff.:
1.
Is the personality (introvert/extrovert)
related to success or failure in a job that
requires contact with people?
2.
Is motivation (high/low) related to the
development of scientific literacy?
15.
"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)
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