# Principles of Macroeconomics Test 2

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```					    AN ANALYSIS OF SCORE
MICROECONOMICS AND
MACROECONOMICS PRINCIPLES

Johnnie B. Linn III
Concord University
Progression of Learning
S

D

Scarcity, Opportunity Cost, Supply and Demand (4 Weeks)

AS                                     MC

MR

Macroeconomics (12 Weeks)             Microeconomics (12 Weeks)
Figure 1. Score distribution of first exam for
microeconomics and macroeconomics

SCORE DISTRIBUTION 2003-2004
EXAM #1

50
40
30

20
10

0
0   1   2   3   4   5   6   7   8    9   10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

MICRO SCORES   MACRO SCORES
Figure 2. Probability distribution of scores
for microeconomics and macroeconomics

PROBABILITY DISTRIBUTIONS OF SCORES

0.14
0.12
0.1
0.08
0.06
0.04
0.02
0
0   1   2   3   4   5   6   7   8     9   10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

MICRO SCORES   MACRO SCORES
Test Score Statistics

Micro:        sample size: 264               mean: 16.88           std. dev: 3.63
Macro:        sample size: 382               mean: 15.80           std. dev: 3.91

The two-sample t-test for difference in means of the two populations is

16.88  15.80
t                   = 3.60.
2      2
3.63 3.91

264   382
Why the Difference?

•   Business majors can learn economics better than non-
•   Students who perform better in economics are more
•   Business majors have more to gain by a good grade in
economics, hence are likely to invest more effort in the
course.
•   Business majors are required to take both
microeconomics and macroeconomics, and most of
them take macroeconomics first, so when they take
microeconomics they are being tested on materials to
which they have been exposed twice.
Table 1. Test Scores for a Macroeconomics
Section.

Group                 Number of Students   Mean    Std. Dev
Total                 67                   16.32   3.65
Not ever taking mi-   29                   15.38   4.02
croeconomics (non-
Having taken mi-      38                   17.03   3.22
croeconomics in the
past, simultane-
ously, or future
Having taken mi-      28                   16.64   2.25
croeconomics in the
future
Having taken mi-      6                    19.33   4.84
croeconomics si-
multaneously
Test Scores for a Macroeconomics Section

MC

MR

D

AS                             AS                     AS              AS   MC

15.38                         16.31            = 1.47   16.64         19.33 MR

29                            4                         28          6

MC

MR
16.64  15.38
t                    = 1.47                                   D
2.252 4.022

28    29
Table 2. Test Scores for a Microeconomics
Section

Group                Number of Students   Mean    Std. Dev
Total                62                   16.05   4.01
Not ever taking      25                   14.96   3.90
macroeconomics
jor)
Having taken mac-    37                   16.84   3.91
roeconomics in the
past, simultane-
ously, or future
Having taken mac-    5                    14.00   3.39
roeconomics in the
future
Having taken mac-    5                    17.20   5.40
roeconomics simul-
taneously
Test Scores for a Microeconomics Section

AS

MC                            MC                    MC        AS       MC

MR   14.96                        MR   17.30         MR   14.00            MR    17.20

25                                27                 5                  5

AS

14.00  14.96
3.392 3.902

5    25
CONCLUSIONS

• A strong correlation exists between better
performance and previous exposure to the
material.
• A weaker correlation exists between better
performance and being a business major,
when previous exposure to the material
has been corrected for.

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