Hannah Johnson
PSQF:4143
Assignment #2
3.2.1. a) In a grouped frequency distribution, we are unable to determine the exact
the exact frequency of a given score in the data.
b) The loss of knowing the frequency of a given score is attributed to the
interva
Hannah Johnson
PSQF:4143
Assignment #3
4.2.1 The difference between a percentile rank and an ordinary percentage is that
an ordinary percentage can be used to show how many answers are correct
while a percentile rank shows how an individuals score compare
Hannah Johnson
PQSF:4143
Assignment #5
6.2.1 A) median: 4.5
B) It would be difficult to estimate the median of this new data set because
replacing one of the 4s with a 5 would allow for four 5s in the distribution. One
would have to assume that all 5s wer
Hannah Johnson
PSQF:4143
Assignment #6
7.1.1 A) Distribution A will show more variability
B) Distribution A will show more variability
7.2.2 A) When calculating the range, the inverse relationship of the variables does
not need to be taken into account. H
Hannah Johnson
PSQF:4143
Assignment #1
2.2.2 a) O
b) U
c) O
d) U
e) O
f) O
g) U
h) U
2.2.4. If a researcher wants to measure a students enthusiasm for the acquisition
of knowledge, they could define this conceptual definition by creating a 100
question su
PSQF:1075 Educational Psychology and Measurement
Week Date
Topic
Assigned Reading
1
August 23rd & Introduction to the Course
Chapter 1
25th
Learning, Teaching and Educational
(quizzes each
Psychology: How do we know what we know? Tuesday)
2
August 30th &
Chapter 2 Review
(Beginning until page 56)
Educational Psychology
Bailey Banks, Matt DeZwarte, Maty Doll, Zachary Meyer, Sam Grubisich, Lauren Jacobson, Kylee Zoske
What Is Development?
Development can be thought of from different
aspects like growing tal
Elementary Statistics
Answers to Homework #1
1.
a)
b)
c)
d)
e)
f)
D
U
U
C
C
D
2.
a)
b)
c)
d)
e)
f)
I
O
R
N
R
O
3.
Tune recognition is probably an "invalid" way to measure musical
ability(Garbage in - Garbage out)
4.
a)
b)
120.35 - 120.45 lbs.
87.75 - 87.8
Elementary Statistics
Answers to Homework (Sections 3 and 4)
The scores for boys and girls from a 3rd grade class on an English
composition test are given below. Use this information to answer
questions 1 and 2.
X
10
9
8
7
6
5
4
Boys
f
0
0
3
6
1
1
1
Girls
Elementary Statistics
Answers to Homework Summation Exercises
1.
a
X = 2 + 4 + 7 + 3 + 6 = 22
b
X = 222
c
X
2
2
4
d
X
i
= 22 + 4 2 + 72 + 32 + 62 = 114
= 4 + 7 + 3 = 14
i= 2
5
e
X
2
i
= 72 + 32 + 62 = 94
i=3
2.
K
a
X = f j X j = 2(4) + 10(5) + 4(6) + 2
Section 15 Homework Answers
'
'
'
1. a. Z r = 0.693, b. Z r = 0.310, c. r = 0.640, d. Z = 0.973, e. = -0.910
2. (1) Ho: = 0, HA: > 0.
(2) = .05
(3) Z(CR) Z > 1.65
(.662 .000)
(4) Zobs =
= 1.99
1 / 12 3
(5) Reject Ho: = 0, and conclude HA: > 0 is likely to
Answers for Section 16
Regression
1. Plot the following regression lines:
a) Y = -3X + 4
b) Y = .5X - 2
c) Y = -2X +1
2a. Given n = 9,
XY = 1,606 , X = 108 ,
Y = 123, X
2
= 1,522 , X = 12, and
Y = 13.67, find the values for b and a in the
equation Y = b
Elementary Statistics
Homework #1
1.
Classify each of the following variables as unordered, discrete ordered
or continuous ordered using the following key.
Key:
U
U
U
U
U
U
2.
D
D
D
D
D
D
U:
D:
C:
C
C
C
C
C
C
a)
b)
c)
d)
e)
f)
unordered
discrete ordered
c
Elementary Statistics
Homework Summation Exercises
1.
Given X1 = 2, X 2 = 4, X 3 = 7, X 4 = 3, X 5 = 6 , find:
a
X
b
X
c
X
2
2
4
d
X
i
i=2
5
e
X
2
i
i= 3
2.
Use the table below to find:
a
X
b
X
c
X
x
8
6
5
4
2
2
f
2
4
10
2
Elementary Statistics
Homework #5
1.
Given X = 20 and S = 3 , find the mean, standard deviation
and variance of each of the following Y scores:
Mean
a.
Y = X + 5
c.
Y = 4X 2
d.
Y = -3X
e.
Variance
Y = 7X
b.
Stand. Dev.
Y = -2X + 6
Use the following table
Elementary Statistics
Homework (Sections 3 and 4)
The scores for boys and girls from a 3rd grade class on an English
composition test are given below. Use this information to answer
questions 1 and 2.
X
10
9
8
7
6
5
4
Boys
f
0
0
3
6
1
1
1
Girls
f
3
2
1
1
Elementary Statistics 7P:143, 22S:102 Homework for Sections 11,12 & 13
1. (a)
(b)
(c)
(d)
If the null hypothesis is true, what is the probability of Type II Error?
If the null hypothesis is false, what is the probability of Type II Error?
If the null hypo
Elementary Statistics
Homework #2B
1.
Draw the relative cumulative frequency curve (ogive)
the frequency distribution from Homework #2 shown below.
X
65-69
60-64
55-59
50-54
45-49
40-44
35-39
30-34
25-29
20-24
2.
f
6
16
34
52
42
22
18
7
2
1
Use the PR and
Elementary Statistics
Homework #6
Items 1-5 are based on the following information:
The number of dollars in tips earned last Sunday by all 20
employees at a local restaurant is given below:
23, 24, 25, 26, 26, 26, 26, 27, 27, 27,
28, 29, 29, 30, 30, 31,