Scatterplots display relationships between two variables
o E.g. GPA& ACT scores
Summarizing relationships between two variables
Deterministic v. Statistical Relationships
Deterministic relationships: one variable perfectly predi
Hy test- will be on final
There are broadly two types of research ethics relevant to social science research
Ethical treatment of human subjects
Reporting your results accurately a
o 26 multiple choice, matching
o 2 open ended
o 1h 20 min
o Two multiple choice questions repeat content from exam 1 (levels of
measurement, shape question)
o One open-ended question similar to exam 1
Suppose you want to test a hypothesis comparing means for two groups
o For example, is the average Com exam score for females different from
the average for males?
Review: Hypothesis tests steps
0. State the null and alternative hypoth
Exam 3 COM 300 Study Guide
-Inferential Statistics and Descriptive statistics - difference?
-What does sampling error mean?
-Types of hypotheses (i.e., alternative and null)
-What is hypothesis testing?
-4 steps of hypothesis testing -
The scientific methods
We are interested in relationships b/w variables
How to collect data to create variables?
We will discuss 3 methods:
o Content analysis
o Measuring behavior
-[Larry Summers] core claim, indeed his only chlaim, of innate difference [in
intelligence between men and women] was that the standard deviation-
Plot, Graphs and Picture
Graphs can convey a story relatively quickly
Experimental study: study in which a researcher manipulates levels of an
independent variable to determine its effects on a dependent variable
Contrast with an observational study, a study in which a researcher does not
Evaluating out Measures
What is a good measure of liberalism, political knowledge, facebook use ,
Criteria for Evaluating Variables
Validity: How well a variable actually measures what you want to measure
o Verbal SAT
Different Cultures Value Different Communication Styles
Michigan State University
Tong Li, Communication Major, Michigan State University
Communication Arts and Science College, Room 147, Wilson Rd, East Lansi 48824. Phone:
LECTURE OUTLINES For Exam 1
- Identification question
- Understanding question
Understanding the Philosophical Foundation of Scientific Knowledge
LECTURE 1 - Course Introduction
- the character of knowledge
Everyday routines that help partners
maintain their connections
13 Common Relational
Openness and routine talk
Talking and listening to one another
a. For each cell, find the expected counts
b. For each cell, find the observed counts
c. For each cell calculate:
(Observed count-expected count)2
d. Calculate chi squared stat
t test example
Is there a difference between Class A
(fashionable dress) and Class B (unfashionable
dress) on the midterm exams?
First: check assumptions
DV=interval or ratio; IV=nominal
Exam scores = normal
2. Formula for r
Discussion differs from text
Z = (case score - mean) = (X-M)
The mean z score for the x, y variables will
Scores higher than the mean are positive
Variables- Things (attitudes, characteristics, behaviors) that change from unit to
unit (person, social group, unit of content)
Variables can be concrete or abstract
o Concrete: age in years
o Abstract: humor assessment (abi
Why talk about science?
Distinguish a scientific approaches to studying human behavior from other
Theory: a set of systematically related statements about relat
Office hours M 2-4 COM 479
What is Com?
Com: the process by which one person stimulates meaning in the mind(s) of
another person (or persons) through verbal and nonverbal messages
Nonverbal message example: cuttin
Today: Sampling to learn about populations
Types of sampling
Does it work?
Sampling is a too used to learn about a population
Instead of doing a complete enumeration, we systematically select a sample to
Common problems with graphs
Lack of Labels
Range of values displayed
o Axes dont start at zero
o Axes do not consistently correspond to units
The scientific method
Theory- empirical generalizations - Observation
Two ethical issues
[Both have to do with attributing credit to people who contributed to the field]
Only take credit for research you have conducted
Give credit to all who have contr
Exam 2 Study Guide-Com 300
Take some ratio data
o E.g. incomes in the US
o COM 300 exam grades
What basic features of these data do we care about?
3 Useful Features of Ratio Data
1. Shape or distribution
2. Central, average, or typical value
Comm 300 Exam 1 Study Guide
How Does Science Differ From Other Forms of Knowing?
Science is systematic
It separates the creation of knowledge from idiosyncratic influences
Nonscientific ways of knowing: talking to people, people telling us thin
Why a Literature Review?
Literature review is a systematic review of relevant information about your topic
Identifies all important previous knowledge about your topic
Constitutes the argument for the advancement of your hypothesis
COM 300 Group Paper
Title: Effects of Food Advertising on Children
Introduction: Obesity is becoming an issue for children starting at young ages. One of
the factors affecting this is what kinds of foods they are eating. Since children are so susceptible
COM 300 Group Paper
6 November 201Effects of Food Advertising on Children
Michigan State Univer
Can Channels influence childrens eating habits?Margaret Gamble, Nancy Cotugna
It is apparent that the younger generation of children in todays society have a
larger body mass index (BMI) than recent decades. This has been linked to children
1. Lock haven university, doesnt list who funded the research. The professor could have a
motive/self interest, since he might dislike social media use.
2. It was an online survey, could use more information.
3. College students. Only surveyed stu
First Exam Study Guide COM 300
The following is a list of many of the main concepts that you may be tested on. It is not
exhaustive, but should give you a good start in studying for the exam.
1 hr 20 minutes, can use calculator (must show all work), formu
Nature of measurements/survey questions
Why does it matter?
Basic idea: Try to ask questions about behaviors, knowledge, attitudes
Example: How many MSU students are on instagram?
Properties of a good survey questions about
9/6/16 Office hours (Thursday 9-11am, 479 Com Arts)
What is communication?
Communication: the process by which one person stimulates meaning in the mind(s) of
another person (or persons) through verbal and nonverbal messages.
Harold Lasswell (1902-1978)