Midterm 1 Review Sheet
Directions: Page 9 provides data from a random sample of GSS 2002 respondents. A
codebook is also provided, which corresponds to the data. Use the information contained
in the data and the codebook to answer all of the exam questions. Page 9 also contains
some useful formulas which will help you perform calculations.
1. How many variables are in the data set (excluding the ID variable)?
2. How many cases are in the data set?
3. What is the level of measurement of each variable (excluding the ID variable)?
How do you know that this is the level of measurement?
1
4. Using the grids provided below, for each variable construct a table containing the
following statistics: frequency distribution, percentage distribution, cumulative
frequency distribution, cumulative percentage distribution. Make sure your tables
contain all of the essential elements of a table.
f
c
%
c%
f
c
%
c%
f
c
%
c%
2
5. Using the grid space provided below, graph each of the variables using either a
bar chart or a histogram (choose the one that you think is most correct). Graph the
number of cases in each category. Make sure your graphs contain all of the
essential elements of a graph.
3
6. Calculate all appropriate (meaning only those that can be meaningfully
interpreted) measures of central tendency (mode, mean, median) for each
variable. Be sure to show all of your work.
4
7. Choosing from among the measures you calculated, decide which measure of
central tendency best describes this data. Explain why you choose this measure.
8. Interpret the substantive meaning of the measure of central tendency that you
calculated for each variable.
5
9. Calculate all appropriate (meaning only those that can be meaningfully
interpreted) measures of variability (IQV, range, IQR, Variance, Standard
Deviation) for each variable. Be sure to show all of your work.
6
10. Using the gird below construct a box plot for any interval/ratio variables. You
may plot multiple box plots on the same axis, if you would like.
11. Choosing from among the measures you calculated, decide which measure of
central variability best describes this data. Explain why you choose this measure.
7
12. Interpret the substantive meaning of the measure of variability that you calculated
for each variable. (3 points)
8
CodeBook
Random Sample from GSS 2002
ID
SEX
CLASS EDUC
1
1
3
17
2
2
2
11
3
1
4
18
4
1
4
18
5
2
3
14
6
2
2
14
7
2
3
16
8
2
2
12
9
2
2
12
10
1
2
12
11
2
3
14
12
1
3
14
13
1
1
14
14
1
3
16
15
2
3
12
16
1
3
18
17
2
3
15
18
1
3
12
19
1
3
12
20
2
2
13
21
2
3
12
22
1
2
16
23
2
2
8
24
2
2
12
25
2
1
10
26
1
3
14
27
2
2
13
28
1
3
16
ID: RESPONDENT’S
IDENTIFICATION NUMBER
SEX: RESPONDENT'S SEX
Value Labels:
1 MALE
2 FEMALE
CLASS: SUBJECTIVE CLASS
IDENTIFACTION
If you were asked to use one of four
names for your social class, which
would you say you belong in: the lower
class, the working class, the middle
class, or the upper class?
Value Labels:
1 LOWER CLASS
2 WORKING CLASS
3 MIDDLE CLASS
4 UPPER CLASS
EDUC: HIGHEST YEAR OF SCHOOL
COMPLETED
How many years did you complete?
Value Labels:
CODE ACTUAL VALUE
More Useful Formulas:
Useful Formulas:
Y =
IQV =
∑Y
S Y2 =
N
K (100 2 − ∑ Pct 2 )
∑ (Y − Y )
N −1
S Y = S Y2
100 2 ( K − 1)
9
2