# PSYC 3500 Lecture Notes - Lecture 1: Twelfth Grade, Continuous Or Discrete Variable, Statistical Inference

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29 Mar 2021
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Department
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Statistics 3500
Practice Exam 1
Part I.
Provide an answer for the following multiple choice, short answer, fill-in-the-blank, and
true/false items. Each item in this section has a value of 1 point.
1. The research process involves a series of steps, or methods, to better learn about and
understand the world around us. Provide two steps in this process.
Identify a problem and formulate research question(s)
Review the literature
Clarify your research question, identify the purpose of the study
Define the population
Identify what will be measured and how
Collect data
Analyze data
2. True or False A researcher interested in antisocial behavior development obtains a sample of
3-year-old children to participate in a research study. The average score for the group of 20 is an
example of a parameter.
3. A researcher is curious about the average number of delinquent offenses committed by every
high school student in the state of Florida. The average obtained is an example of a ______.
a. sample
b. statistic
c. population
d. parameter
4. Statistical methods that organize, summarize, or simplify data are called _______.
a. parameters
b. statistics
c. descriptive statistics
d. inferential statistics
5. True or False The discrepancy between a statistic and the corresponding parameter is
sampling error.
6. Although research questions usually concern a ______, the actual research is typically
conducted with a ______.
a. sample, statistic
b. population, parameter
c. sample, population
d. population, sample
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7. A recent study reports that at-risk youth who participated in an afterschool program had higher
test scores than students who did not participate in the program. For this study, what is the
independent variable? What is the dependent variable?
IV = afterschool program
DV = test scores
8. A researcher wants to examine the relationship between margarine consumption and crime. A
group of 500 adults is selected and each adult is asked to report how much margarine they
consumed and how many criminal acts they committed each month. What research method is
being used in this study?
a. experimental method
b. correlational method
c. non-experimental method comparing two groups
d. none of the above
9. For a research study comparing attitude scores for males and females, participant gender is an
example of what kind of variable?
a. an independent variable
b. a dependent variable
c. a quasi-independent variable
d. a quasi-dependent variable
10. True or False The amount of time to solve a problem is an example of a discrete variable.
11. True or False The number of males in each class offered by the college is an example of a
continuous variable.
12. Using letter grades (A, B, C, D, and F) to classify student performance on an exam is an
example of measurement on a(n) _______ scale of measurement.
a. nominal
b. ordinal
c. interval
d. ratio
13. After measuring two individuals, a researcher can say that Tom’s score is 4 points higher
than Bill’s. The measurements must come from a(n) _______ scale..
a. nominal
b. ordinal
c. interval
d. interval or ratio
14. Provide an example of a measure that follows a ratio scale of measurement.
GPA, time, weight, number of days in jail
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15. Real limits are an important consideration when measuring a ______ variable.
a. ratio scale
b. ratio or interval scale
c. discrete
d. continuous
16. True or False The results of a correlational study demonstrates a cause and effect
relationship, as changing one variable causes changes to occur in a second variable.
17. In an experimental study, basic techniques that researchers use to control for participant and
environmental variables in a study includes
a. matching study participants
b. random assignment
c. holding variables constant
d. all of the above
e. a & b only
f. a & c only
18. True or False In a frequency distribution table, it is customary to list the possible scores
from highest to lowest.
19. In a grouped frequency distribution one interval is listed as 50-59. Assuming that the scores
are measuring a continuous variable, what is the lower and upper real limit of this interval?
a. 50 and 59
b. 50.5 and 59.5
c. 49.5 and 59.5
d. 49.5 and 60.5
20. True or False On a statistics exam you would rather score at the 25th percentile than at the
95th percentile.
21. For the following frequency distribution of quiz scores, how many individuals took the quiz?
X
f
5
6
4
5
3
5
2
3
1
2
∑X = 6+5+5+3+2 = 21
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