low degree of some others.

CLASS EXERCISES

1. Many of the tests and experiments already described should have shown
many of the individual differences of the members of the class. The
teacher will find in the author's _Examination of School Children_ a
series of group tests with norms which can be used for a further study
of individual differences.

2. The tapping experiment described in the first chapter can now be
repeated and the results taken as a measure of reaction time.

3. You should now have available the records of all the tests and
experiments so far given that show individual differences. Make out a
table showing the rank of each student in the various tests. Compute the
average rank of each student for all the tests. This average rank may be
taken as a measure of the intelligence of the students, as far as such
can be determined by the tests used. Correlate this ranking with
standing in the high school classes. It will give a positive
correlation, not perfect, however. Why not? If your measures of
intelligence were absolutely correct, you still would not get a perfect
correlation with high school standing. Why not?

4. If you had a correct measure of intelligence of 100 mature people in
your city, selected at random, would this measure give you an exact
measure of their success in life? Give the reason for your answer.

5. Of all the tests and experiments previously described in this book,
which gives the best indication of success in high school?

6. If the class in psychology is a large one, a graph should be prepared
showing the distribution of abilities in the class. For this purpose,
you will have to use the absolute measures instead of ranks. Find the
average for each test used. Make these averages all the same by
multiplying the low ones and dividing the high ones. Then all the grades
of each student can be added. This will give each test the same weight
in the average. The use of a slide rule will make this transference to a
new average very easy. A more accurate method for this computation is
described in the author's _Examination of School Children_, p. 65.

The students should make a study of individual differences and the
distribution of ability in some grade below the high school. The tests
described in this chapter can be used for that purpose.

7. Is it a good thing for high school students to find out how they
compare with others in their various mental functions? If you have p