PSC 103A: Homework 1 Answer Key
Answer each of the questions.
1. Indicate whether each variable a nominal, ordinal, interval, or ratio measure. Explain the
reasons for your choices.
1a. inches on a yard stick
Ratio.
1b. social security numbers
Nominal
1c.
PSC 103A Homework #4
Due November 12, Lab Session (Day Before Midterm 2)
Please do not copy definitions from the book, web, or lecture notes.
1.
Define the following terms:
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
o.
p.
q.
r.
Beta, Type II error
Power
P-
SYLLABUS
PSYCHOLOGY 103A
STATISTICAL ANALYSIS OF PSYCHOLOGICAL DATA
Fall 2002
Instructor:
Dr. Keith Widaman
Office hours:
Teaching Assistant:
Office hours:
Office:
265 Young Hall
754-8288
Tuesdays and Thursdays, 10:00 am to 11:45 am, and by appointment
Ga
HW2 Solutions
Text p. 87
3.4(a) z = .6745 (or .675) by interpolation
X = 985.12 and 964.88
Or from 985 to 965 encompass middle 50%
3.4(b) 985 (50% below 975 + 25% from 975-985)
3.4(c) z = 1.96
X = 945.6 and 1004.4
Or from 946 to 1004 encompass 95% of scor
PSC 103A Homework #5
Due December 3, Last Lab Session
Please do not copy definitions from the book, web, or lecture notes.
1.
Define the following terms:
a.
Correlation
b.
Pearson r
c.
Point-biserial r (rpb)
d.
Phi coefficient
e.
Spearman Rank Order corre
HW#5 Solutions
1.
Define the following terms:
a.
Correlation: The degree of relationship between two variables
b.
Pearson r: An index ranging between 1 and +1 that reflects the direction and
degree of linear relationship between two variables.
c.
Point-bi
Homework 3 Solutions
1. normal curve Mathematically defined symmetrical, unimodal distribution. Also called
the bell-shaped curve. There are many normal curves, with the unit standard normal
curve having M = 0, SD = 1.
2. If you take a positively skewed d
HW 4 Solutions
1a
1b
1c
1d
1e
1f
1g
1h
1i
1j
1k
1l
1m
1n
1o
1p
1q
1r
Beta, Type II error: Failing to reject the null hypothesis when in fact it is false.
Power: The probability the study will yield a statistically significant result if the
research (alter
PSC 103a: homework #1 Solutions
Problem 1
a. Equal-interval: (in class, this was called an interval level scale): a scale with
magnitude and equal intervals, but an arbitrary zero point. Example: Celsius scale.
b. Rank-order: (in class, this was called an
Chapter 3: Graphical Methods for Describing Data
Section 3.3-3.4
Name _
1. A report in the Des Moines Register presented the average number of years of teaching
experience for the teachers in elementary schools in Des Moines, Iowa. These data
appear in th
Chapter 3 Quiz 2, Form A Answer Key
1.
a)
10
6
Count
14
2
0
4
8
12
16
20
24
Years Experience
b)
2.
This is a fairly symmetrical distribution with no apparent outliers.
anything it is slightly skewed toward the higher values.
If
a)
Number Disturbed
20
18
1
Chapter 2: Collecting Data Concept Quiz
1. T
2. T
3. T
4. T
5. T
6. V
7. T
8. T
9. F
10. C
Chapter 2: Collecting Data Free Response
1. Censuses are outdated and only taken once every ten years.
2. A simple random sample gives everyone in the population an
Page 1
PSC 103
Homework #1
Due at beginning of Lab, Tuesday, 8 Oct 2002
Notes: A.
B.
C.
D.
SAS is not required to complete this homework assignment.
Where applicable, show all calculations as well as the answers.
Type or write legibly.
Do not copy definit
PSC 103a
Homework #2
Due in Lab, October 22
Do not use SAS to complete problems 1 - 3, this set.
1.
Define the following terms:
1. Percentile rank
2. Linear transformation
3. Correlation coefficient
4. Z-score
5. Positive correlation
6. Slope
7. Intercept
PSC 103 Advanced Research Design
Homework #3
Due October 29, Lab Session
Please do not copy definitions from the web, book, or lecture notesyou will not have these
resources during exams.
Define the following terms:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
normal c
Homework 2 Answer Key
1. What are three different ways to display data? Why do we display data? What are some of
the benefits and drawbacks of each way?
Histograms, boxplots, and frequency tables. We display data to see potentially meaningful
patterns tha
Homework 1 Answer Key
1. Calculate the mean, median and mode of x, y, and z
The mean of x is
The mean of y is
The mean of z is
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To calculate the median of x, first order x
cfw_2, 3, 5,
Ordinal variable
Interval distance between numbers has meaning
True zero means that a value of 0 means complete absence of the variable
o (-10 Celsius = very low energy)
IQ scores 0 doesnt mean you have an absence of intelligence ,just have very low int
Homework 4 Answer Key
1. What are standard scores and why do we use them? Give an example.
Standard scores represent the transformation of a variable from its original units (e.g. pounds,
inches, points), to the number of standard deviations from t
1/18/17
Central Tendency and Variability
January 18th, 2017
Central Tendency and Variability
Vast majority of research in the social sciences
examines a mean difference between two
groups
Females live longer than males 2 groups: male & female, measuri
2/5/17
Hypothesis Testing with Means
of Samples
PSC103A
So far
Weve learned about hypothesis testing with
a comparison distribution of individuals and
our data consisted of an individual score
Are UCD undergraduates smarter than the
average American ( =
Hypothesis Testing with Means of
Sample (II)
PSC103A
look in notebook
uploaded on canvas
Review
Central Limit Theorem
Given a populations with mean and variance s2, the
sampling distribution of the mean (the distribution of
sample means) will have a mean
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Hypothesis Testing
Applied to Means (III)
PSC103A
Announcements
Review is on Wednesday
Exam is on the following Wednesday
Homework 8 is due this Wednesday (Feb.
15th)
1
Last Time
8 (15%): Too fast; 3 (5%): Too slow; 44
(80%): Just right
46 (84%): Eve
Introduction to
Hypothesis Testing
PSC103A
Announcements
Homework 5 is up on canvas
Due on Monday, Feb. 6th
Exams are being graded
Go over them on Monday, Feb. 6th
1
Review from Last Class
Topics
Transformations
z-scores
Normal Distributions
Stan