Statistics 203
Midterm 1
DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO!
Name:
_
Student Number:
_
Signature:
_
Instructions:
1. Do not panic. It rarely helps.
2. Read all questions carefully.
3. You do not need to provide an explanation for multiple
Statistics 203
SAMPLE Midterm 2
This sample is supposed to give you an example of the STYLE of some
of the questions that might be asked on the March 17 midterm. There
may be more or less questions. I may also take questions from the
suggested problems,
Statistics 203
Assignment 6
1. Suppose that a random sample of 50 bottles of a particular brand of cough syrup
is selected, and the alcohol content of each bottle is determined. Let denote the
average alcohol content for the population of all bottles of t
SOLUTIONS: CHISQUARE DISTRIBUTION QUESTIONS
PURPOSE
The facilitator used past papers, past assignments and past discussion class handouts from the
various modules namely; STA1510, STA1610 and STA1501 to paste together a worksheet that
resembled the type
R. Insley STATISTICS 203 Mar 30, 2011
Midterm 2
Marks [ /40]
Name: lit/s LEZ St. Number:
(Please Print and Circle your family name)
NOTE: SHOW ALL WORK AND FORMULAS USED.
1. Answer True (T) or False (F) to each of the questions below. True/False
[1] a) St
I
R. INSLEY 5/4"pr WM L0 a [Tl/NM [Ski/H1
NAME: M 5' LE 1 STUDENT #:
(please print and circle family name)
Marks [ I90] SHOW ALL WORK
1. Answer True (T) or False (F) to each of the questions below. True/False
[1] a) The variance, Index of Dispersion and
How to Use PASW on the Stats Lab PCs
This short howto handout is prepared for students who have little or no experience with PASW on a PC.
1. Starting PASW
Click the Start button, and go up to Programs, then right and up to SPSS Inc. Click on PASW Statis
Solutions to Assignment 7
1.
The answers are in the text.
2.
Descriptive Statistics
Descriptive Statistics
N
Difference
500
Valid N (listwise)
Minimum
7.94
Maximum
3.00
Mean
2.0942
Std. Deviation
1.83184
500
Histogram of 500 X1bar  X2bar values
50
Freq
STATISTICS 203
Assignment #7
Not to be handed in
NOTE: For each test that you carry out below, be sure to go through the five steps.
1.
Do the following problems from the text.
Chapter 7:
Chapter 9:
Chapter 10:
Chapter 11:
2.
#15
# 8
# 8
#10 (In part (e)
Solutions to assignment 6
1.
The answers are in the text.
2.
_
The sampling distribution (histogram) of sample means, X, is normal in shape whenever the
population from which you sample is normal OR if the sample size is large ( 30).
3.
a)
_
X = ( Xi)/N =
STATISTICS 203
Assignment #6
Due Monday Apr. 4/11 @ 4:30 PM
1.
Do problem #26 from chapter 6 of the text.
2.
Give a clear statement of the Central Limit Theorem.
3.
Let W equal the weight in grams of a 52gram snack pack of candies. Assume that the distri
STATISTICS 203
Assignment #5
Due on Monday Mar. 21/11 at 4:30 PM
1.
Do problems #9 and #10 from chapter 6 of the text.
2. a)
Suppose a population consists of the four numbers 4, 6, 8 and 9. List all random samples of size 2
that can be formed by sampling
STATISTICS 203
Solutions to Assignment 5
2.
Solutions are in the text.
There are 4 x 4 = 16 possible samples.
There are 4 x 3 = 12 possible samples.
(a)
Sample
(b)
Mean
(c)
Sample
cfw_4,4
cfw_4,6
cfw_4,8
cfw_4,9
cfw_6,4
cfw_6,6
cfw_6,8
cfw_6,9
cfw_8,4
cfw
3/71/7/16' M/EZfr . , ;
'._
R. Insley STATISTICS 203 Mar. 23, 200]
Midterm 2
Marks [ I 40 ]
Name: (A/ i L E 2:
St. Number:
I l
1. Circle the letter of each TRUE statement below. (1 mark each) 5
The standard error of the mean is just the standard deviatio
Practice problems for Homework 12  condence intervals and hypothesis testing.
Read sections 10.2.3 and 10.3 of the text.
Solve the practice problems below.
Open the Homework Assignment 12 and solve the problems.
Notice that Quiz 12 covers condence int
Confidence interval: is an interval of values computed from sample data that is likely to cover the true parameter of
interest.
Hypothesis testing or significance testingis a method for testing a claim or hypothesis about a parameter in a
population, usin
NATS 1500
Sample questions for final exam
The onehour midterm test had 28 questions with 21 multiple choice and 7 open questions
including 3 'essay' questions.
The final exam is a twohour exam and will have approximately 40 multiple choice questions, 5
Case Processing Summary
Cases
Valid
Missing
Total
N
Employment
Category * Gender
Percent
N
Percent
N
Percent
474
100.0%
0
.0%
474
100.0%
dependent variable
independent variable
All students should
reproduce this table.
Marginal distribution of
Employment
Chapter 9: Nonparametric Tests of Significance:
1. A oneway ChiSquare test or Goodnessoffit test. Study pages 306 to the
top of 312. Do problems # 2, 4, 7 and 8.
The objective of this test is to determine how well an observed set of
frequencies, fo, f
z* =
[(P1P2) 0]
/ sP1P2 = (.554.585)/.052 = .596
Pvalue 2*.275 = .55 >
_ Z
z*=.596
5.
0
=> Do not reject Ho
There is no evidence that the two groups differ on the issue of stricter gun
control.
Comparing the same sample measured twice: (Repeated M
x1x
x2
iii)
The Mean Deviation:
e.g. cfw_4, 7, 3, 9, 2
xi
4
7
3
9
2
(deviations)
xi x
4 5 = 1
75= 2
3 5 = 2
95= 4
2 5 = 3
Sum =:
0
(absolute
deviations)
xi x
1
2
2
4
3
12
=>
x3
x
x1
x4
_
L
H
_
x=5
_
_
The deviation of xi from the mean, x, is xi x
Th
Statistics 203
Chapter 1:
Why the Social Researcher Uses Statistics
Study Chapter 1and Appendix B.
Can you think of situations in which you have given out personal information?
 Telephone or computer surveys.
 Food store point systems.
 Air miles cards
Ex. 2 (This example uses the table to find z from a given area (probability).
Find the value of z0 such that : P(Z > z0) = .6064
Since the area = .6064 > .5, z0 must be negative.
_ Z
zo 0
z1
We need the value of z0 with area 1 equal to .1064.
This is the
_
_[_]_ X
_
x _
x1.96 /N
x+1.96/N
For other levels of confidence we use
values different from 1.96 obtained
from table A.
Confidence level
99%
95%
90%
Total area = = 1 confidence level
/2 = .025
zvalue
2.575
1.96
1.64
1%
5%
10%
/2 = .025
_ Z
1.96
0
1.
STATISTICS 203
Assignment #4
Due Monday Feb. 28/11 at 4:30 PM
Show your work. (These are all problems that should be done by hand.)
1.
Textbook: Chapter 5: #11, #17, #25.
2.
Assume Z ~ N(0,1) (Standard normal).
(a)
Find the area under the normal curve bet
Introduction to Statistics for the Social Sciences
STATISTICS 203

Fall 2013
Assignment 5 PART 1, Stat 203 (Surrey) Fall 2013
Due Tuesday, November 5th, 1:30pm (Surrey drop box)
Important instructions: Ensure that your answers are brief and easy to find
(annoying the marker is usually a bad strategy). I dont care too much about
si