Assignments &Exam infoPsych Stats Page

UPDATED 5/7/97

Announcements for 5/7/97 Better late than never!! Click here to see a sample question for correlation and regression.

Here is the test location and time for anyone not sure. Location = basement of the library in studio #3. Time = 2:00 to 5:00 (You can take extra time if you need it)

Request from your web site author

Please e-mail me your opinion as to how good (or bad) you think this web site is. Also please let me know what you think would make this site better. Thank you, William Fuller st7jv@jetson.uh.edu

Homework Assignment #3

Frequency Distribution for Exam #1

(This is a stem and leaf plot of the first exams scores)
3/ 2,5
4/0,2,4
5/ 0,2
6/ 0,4,8
7/ 4,5,7
8/ 0,1,5,5,7,7
9/ 0,1,2,3,5
10/ 0,0,5,5,8,9,9,
11/ 0,5,5,5,5
Compute the MEAN, MEDIAN, MODE, STANDARD DEVIATION, and Your Z score and Your percentile rank. Additionally, in a paragraph or less explain what you feel is the most fair way to adjust the grades for this test.

HOMEWORK # 2

Home Work # 2 - Stem and Leaf Plots

Here are data for 23 midterm exam score:

83 78 61 100 91 55
34 59 58 72 68 71
86 86 83 85 79 72
78 88 94 97 96

We will now build a stem and leaf plot:
The first digit of each score is the stem, the second digit is the leaf.
For example -

STEM | LEAF
3 | 4
4 |
5 | 5 9 8
6 | 1 8
7 | 8 2 1 9 2 8
8 | 3 6 6 3 5 8
9 | 1 4 7 6
10 | 0

Create Stem and leaf plots on paper for the following data sets:

Data set 1

6 12 5 16
10 11 15 14
22 19 15 14
12 8 17 2
17 27 21 13

Data set 2

189 258 192 212
205 209 229 233
224 226 216 211
200 197 231 205
227 224 211 200

Data set 3

9.2 12.7 7.9 8.8 8.2
10.6 6.4 11.5 9.1 10.3
8.5 9.0 8.4 7.7 7.0
11.3 5.0 12.2 10.9 5.6
7.1 10.1 6.3 5.8 8.4

Data set 4: Problem

At a small college, many undergraduates students attend school part-time
while working toward their degrees. The following data set shows how many
semesters a sample of thirty of these students were enrolled before graduating.

8 9 12 10 8 8
8 10 8 10 10 9
9 8 8 9 10 8
8 16 9 12 11 12
11 12 9 8 13 11

a. Construct a stem and leaf plot of the data by using the digits 0 and
1 as stems.

b. Construct a quick graph of the data by using the numbers 8,9 10, 11, 12,
13, 14, 16, and 16 as stems. Record the count for each stem value to complete
the graph.

c. Compare the two graphs and state which graph best describes the data and
why.

One last thing to do: Take the data sets from Homework 1 and construct stem
and leaf plots for them.

HOMEWORK # 1

Here are three data sets that you can begin to descriptively analyze:

Data 1 : The number of problems solved correctly by 100 students
5 8 3 6 5 8 3 7 4 7
6 8 7 4 6 5 8 7 10 6
5 3 6 1 8 6 8 5 7 10
8 9 6 9 6 5 9 9 6 3
8 5 8 4 8 6 7 4 10 5
8 7 6 8 5 7 6 9 6 10
4 8 6 8 6 5 4 7 9 6
7 4 5 5 9 6 6 7 4 5
10 3 5 7 9 10 6 7 6 6
6 9 8 7 8 5 7 4 6 8

Data 2: Scores of 85 students on 50 pt test
39 42 30 11 35 25 18 26 37 15
29 22 33 32 21 43 11 11 32 29
44 26 30 49 13 38 26 30 45 21
31 28 14 35 10 41 15 39 33 34
46 21 38 26 26 37 37 14 26 24
32 15 22 28 33 47 9 22 31 20
37 40 20 39 30 18 29 35 41 21
26 25 29 33 23 30 43 28 32 32
34 28 38 32 31

Data 3: A survey for raising taxes
f = favor lower taxes
o = oppose lower taxes
n = no opinion
N = 50

1 o 18 f 35 n
2 f 19 f 36 o
3 f 20 f 37 f
4 n 21 o 38 n
5 n 22 f 39 o
6 f 23 f 40 f
7 o 24 n 41 f
8 f 25 n 42 n
9 f 26 o 43 o
10 n 27 o 44 o
11 o 28 f 45 f
12 f 29 n 46 o
13 o 30 o 47 f
14 f 31 f 48 f
15 o 32 f 49 o
16 f 33 n 50 n
17 n 34 o

Instructions for all data sets:
On graph paper:
1. List the data
2. Sort the data
3. List frequency
4. List cumulative frequency
5. Group data if necessary
6. Plot data with frequency polygons
7. Create histograms
8. One sentence interpretation

This page is maintained
by William Fuller