This part of the exam is closed-book. It is worth 15 points and should take approximately 15 minutes to complete. When you are done with this part of the exam, please turn it in and pick up Part B.
[Comment: This exam covered Study Design, Epi6Basics, and CONT-SEV. The content of your exam may differ.]
(1) Briefly, describe the main difference between experimental study designs and observational study designs.
(2) Differentiate between a "variable" and "value."
(3) Differentiate between a longitudinal study a cross-sectional study.
(4) What does a computer operating system do?
(5) What is the purpose of data documentation files
(6) What type of information would your want to include in a data documentation (DD) file?
(7) Before a data set can be analyzed in the ANALYSIS module, it must be opened. What command is
used for this purpose?
(8) DOS filenames are limited to an 8 character filename and 3 character ___________. (Fill in the blank.)
(9) With respect to ANOVA, when we assume homoscedasticity, the estimate of the common
(within-group) variance has many names. Provide one.
(10) With respect to the statistic cited in question 9, above, where does one find this statistic in an
ANOVA table. (Circle the correct boxed location.)
Source of Variance | Sum of Squares | Degrees of freedom | Mean Squares | F statistic | p value |
Between | _ | _ | _ | _ | _ |
Within | _ | _ | _ | ||
Total | _ | _ | _ |
(11) How many degrees of freedom are in the numerator of an ANOVA F statistic? [The numerator is
the Between-Groups Variance statistic.]
(12) What statistics contributed to the drawing of a quartile plot?
SOCPSYCH.REC: A social psychologist develops a scale that he calls the "sense of coherence" scale. This scale measures a general orientation that sees life as meaningful and manageable. The psychologist theorizes that one's sense of cohorence fosters coping and health, and therefore deserves additional study. To study his theory, sense of cohorence (SOC) is measured among three groups. Group 1 comprises concentration camp survivors, group 2 comprises concentration camp guards, and group 3 comprises a sample of the general population. Data are:
Group 1: 131, 167, 113, 134, 178
Group 2: 105, 52, 71, 56, 85
Group 3: 236, 168, 208, 175, 113