PSY-3204
CHAPTER ONE OUTL INE-
I.
Methods of Acquiring Knowledge
A. Authority. One accepts information as being true because someone who is
supposed to know tells you something is true.
B. Rationalism. This method uses reason alone to arrive at k
Statistical Methods in Psychology (PSY 3204)
Practice Exam 1
1) Please write down the statistical formulas (conceptual, not computational) that were given in
class for the following terms (26 points).
a) X
b) Y
2
c) S X
d) SY2
e) S X
'
'
j) Z X i k) ZYi
f
Let's assume you are conducting an experiment to determine the effect of a new drug on the incidence of epileptic seizures. You select 20 epileptics from the 150 epileptics being treated at a nearby hospital and administer the drug to them. You record the
Quiz 1 Study Guide
Chapter 1.
1.
Descriptive statistics:
Used by psychologists to summarize and describe a group of numbers from a research
study.
EX: mean, median, mode, and correlational relationship
2.
Inferential statistics:
Used by psychologists to d
If a stranger gives you a coin and you toss it 1,000,000 times and it lands on heads 600,000 times, what is
p(Heads) for that coin?
0.5000
0.6000
0.4000
0.0000
The statistic used in the sign test measures _.
the difference between the means of the two gro
Chapter 7 Quiz
Questions: 15
1. (Points: 1)
The regression of Y on X _
a. predicts X' given X
b. predicts X given Y
c. predicts Y given Y'
d. predicts Y given X
Save Answer
2. (Points: 1)
Exhibit 7-1
A researcher collects data on the relationship between
P SY3204 C HAPTER 7 QU IZ
1. The regression of Y on X _
a. predicts Y g iven X
2. A researcher collects data on the relationship between the
amount of daily exercise an individual gets and the percent body
fat of the individual. The following scores are r
PSY 3204- CHAPTER 3
I.
Constructing Frequency Distributions
A. A list of rank ordered scores and their frequency of occurrence in tabular form
is called a frequency distribution. When the data is rank ordered, it is easier to understand.
B. Groupi
PSY3204-CHPT.1 EXERCISES AND SOLUTIONS
Exercise
Complete the following questions on a sheet of paper. Check your answers on the Exercise Solutions page.
1. What is the difference between rationalism and the scientific method? 2. A social scientist m
CHAPTER 6
A scatter plot _.
Student Response 1. must 2. is Correct Answer
be linear
a frequency graph of X values to do with electron scatter a graph of paired X and Y values
3. has 4. is
Score: 1/1 2.
If a relationship i
The nondirectional alternative hypothesis asserts that _.
the results of the experiment were due to chance alone
no conclusions can be drawn from the experiment
Correct!
the independent variable has an effect
the independent variable has no effect
Questio
1. A graduate statistics class is unhappy with the midterm grades. The majority of students scored 45 or
below on a 100-point scale, with just several students performing very well. Which type of distribution do
the test scores represent?
Answer: positive
Chapter 3 Terms/Definitions
scatterplot: A graph that depicts the relation between two scale variables. The values of each variable
are marked along the two axes, and a mark is made to indicate the intersection of the two scores for
each participant.
line
A teacher was interested in the relationship between the number of credit hours her students were
registered for that semester, the number of hours they watched TV, and the number of hours of leisure
reading they engaged in during a typical week. Six stud
1. Which statement best describes an interaction in a two-way ANOVA?
Answer: The two independent variables have a combined effect on the dependent variable
that is not present with either independent variable alone.
2. Dore is measuring the effects of fiv
1. You are comparing spatial ability scores for four groups. You find that the F statistic for your test is
4.01, and the cutoff value you identified prior to your analysis was 3.45. Do you reject or fail to
reject the null hypothesis and what, if any, ot
1. Why is it necessary according to APA standards to report descriptive statistics for two samples in
addition to reporting the p value?
Answer: They provide additional information about the group differences that readers often
2.
turn to.
A group of rats
1. There are five factors that impact power, reviewed in our textbook. Which of the following is not
one of those factors?
Answer: reducing between-group differences.
2. In calculating confidence intervals in a z distribution, we start by finding the z sc
Chapter 8 Terms/Definitions
1. point estimate: A summary
statistic from a sample that is just one
number used as an estimate of the
population parameter.
2. interval estimate: An estimate
based on a sample statistic, providing
a range of plausible values
Chapter 6 Terms/Definitions
normal curve: A specific bell-shaped curve that is unimodal, symmetric, and defined mathematically.
standardization: A process that converts individual scores from different normal distributions to a
shared normal distribution
Chapter 5 Terms/Definitions
random sample: A subset of a population selected using a method that ensures that every member
of the population has an equal chance of being selected into the study.
replication: The duplication of scientific results, ideally
Chapter 4 Terms/Definitions
central tendency: A descriptive statistic that best represents the center of a data set, the particular
value that all the other data seem to be gathering around.
parameter: A number based on the whole population; it is usually
Attenuation
The reduction in a correlation due
to unreliability of measures
Central tendency
Typical or most representative
value of a group of scores
Central Tendency and Variability in
Research articles
Mean and SD are commonly reported in research
arti
I.
The Normal Curve
A. Important in behavioral sciences. 1. Many variables of interest are approximately normally distributed. 2. Statistical inference tests have sampling distributions which become
normally distributed as sample size increases.
3.
PSY 3204 CHAPTER 2 REVIEW
I.
Study Hints for the Student
A. Review basic algebra but don't be afraid that the mathematics will be too
hard.
B. Become very familiar with the notations in the book. C. Don't fall behind. The material in the book is c
PSY3204-CHPT.1 CONCEPT REVIEW
Concept Review
On a sheet of paper, fill in the blanks with word(s), number(s), or equation(s) that best completes each sentence. Check your answers on the Concept Review Solutions page. There are at least four methods