Lab 9
Stat 124
Condence Intervals and Hypothesis Testing
1
t-Tests in R
We know that when we dont know we must use a t-test instead of a z-test to test our hypotheses, and a
t* instead of a z* in our condence intervals. The real question is, how do we mak

Stat 121
Assignment 5 (Chapter 18)
Due in class on Monday March 30, 2015
(Although I do not ask for condence intervals for all questions, it is a good idea to practice
constructing condence intervals. )
Question 1
(Textbook Question 18.27) The Trial Urban

Stat 121 Assignment 3
Chapters 11 and 12
Due in class March 16.
Make sure your assignment is clean looking, and has your name and student number on it. This
assignment includes 7 questions. The total number of points is 32.
Question 1 (2 points)
(Textbook

Stat 124
Assignment 6 (Last One!)
(7.73*, 7.74, 7.78*, 7.92, 7.94*, 7.123) *=Revised
[Q1]. 7.73 Comparison of blood lipid levels in males and females. Coronary heart
disease (CHD) begins in young adulthood and is the fifth leading cause of death among adu

OKANAGAN COLLEGE
Department of Mathematics and Statistics
ELEMENTARY STATISTICS
STAT 121 - REVIEW SOLUTIONS
True or False
(1) T
(2) F
(3) F
(4) F
(5) T
(6) F
(7) F
(8) T
(9) T
(10) T
Multiple Choice
(1) (b)
(7) (c)
(2) (d)
(8) (b)
(3) (d)
(9) (e)
(4) (d)

OKANAGAN COLLEGE
Department of Mathematics and Statistics
BUSINESS STATISTICS
STAT 124 - MIDTERM REVIEW
Part A - True or False (1 mark each)
(1)
A statistic is a known quantity that describes the characteristic of a sample.
(2)
The regression model gives

Stat 121 Assignment 1
Due in class February 5.
Make sure your assignment is clean looking, and has your name and student number on it.
1. (Text Q1.24) Protecting wood How can we help wood surfaces resist weathering, especially when
restoring historic wood

Okanagan College
Department of Mathematics and Statistics
Business Statistics
Stat 124
Assignment 2
SOLUTIONS
(1) (10 points)
(a) (2 points) S& P Market is the explanatory variable, Apple Stock is the response variable.
(b) (2 points) The data is appropri

Okanagan College
Department of Mathematics and Statistics
Business Statistics
Stat 124
Assignment 1
SOLUTIONS
(1) (15 points) The student union wants to determine the mean number of hours per
week a student at Okanagan College study. To accomplish this, s

Okanagan College
Department of Mathematics and Statistics
Business Statistics
Stat 124
Assignment 4
Solutions
(1) The service manager for Air Canada is uncertain about the time needed for the ground
crew to turn an airplane around from the time it lands u

Okanagan College
Department of Mathematics and Statistics
Business Statistics
Stat 124
Winter 2016
Assignment 5
SOLUTIONS
1. A medical researcher wishes to see whether the pulse rates of smokers are higher
than the pulse rates of nonsmokers. Samples of 10

Quiz 2
Name:
St udent Number:
This exam includes 4 questions. The total number of points is 35. You
MUST show all your work for full marks. Please do not write on the
tables since we still need them for the Final Exam.
Question 1 (10 points)
The platypn

Quiz 2
Name:
Student Number:
This exam includes 4 questions. The total number of points is 35. You
MUST show all yolu~ work for full marks. Please do not write on the
tables since we still need them for the Final Exam.
Question 1 (10 points)
The platypl

Stat 121 Assignment 2
Chapters 4,5, and 8
Due in class February 16.
Make sure your assignment is clean looking, and has your name and student number on it.
1. (Text Q4.28*Revised Slightly) Sparrowhawk Colonies One of natures patterns connects the percent

Stat 121
Assignment #4
(Chapters 14, 15, and 16 Questions: 14.20, 14.27, 14.28, 15.29, 15.35, 15.40, 16.42)
1). Question 14.20 in the textbook. Young men in North America and Europe (but not in Asia) tend to think they
need more muscle to be attractive. O

Stat 121
Assignment 6 (Last One!)
(Chapter 19 #25, 26, 27, 32, 33, 52)
*Exercises 19.25 to 19.34 are based on summary statistics rather than raw data. This information is
typically all that is presented in published reports. You can perform inference proc

Stat 121
Lab 1
Introduction to R
Today we will be getting used to R, and learn some commands to get us started. R is
freeware and is available to be downloaded at http:/www.r-project.org, or just Google R.
R is a mega-capable calculator, but since it is j

Stat 124s
Lab 2
Data Visualization in R
Today we will have a look at how to generate some graphs in R, as well as how to calculate
the measures of center and spread. The dataset we will be using is called ChickWeight.
Lets get started by opening up a new

Stat 124
Lab 3
Working with Data
Before we begin, a completely unrelated joke, just because it made me laugh:
First we will look at two dierent ways of bringing in data from various sources when it is
not found in a library in R. Then we will look at some

Stat 124
Lab 4
Scatterplots and Regression
Today we will examine the Hot/Crazy Scale, a graph used to display someones hot-to-crazy
ratio. As Barney explains in How I Met Your Mother, a person is allowed to be crazy, as
long as they are equally hot. Ideal

Stat 124
Lab 5
Regression and Outliers
Today we will be going through an example of how to treat outliers.
1
Mutual Funds Question
Investment advertisements always warn that past performance does not guarantee future
results. Here is an example that shows

Stat 124
Lab 6
Midterm Review Using R
Today will be a review of nding the slope and intercept by hand, as well as nding the
regression line using R. You will not be learning new commands today, but you may want
to refer to old labs to refresh your memory

Stat 124 Lab 71
Investigating the Central Limit Theorem
The Central Limit Theorem (CLT) states three facts about the statistics of sample means. Remember what
we are doing in general: Given a population, we take samples of size n and from these samples we

Lab 8
Stat 124
Condence Intervals and Hypothesis Testing
Now that you know what condence intervals are and what hypothesis testing is, it is time to see how we can
make R do the work for us! As I have mentioned a few times, the assumption that we know the

Lab 10
Stat 124
Condence Intervals and Hypothesis Testing for Two Independent Samples
1
t-Tests for Two Independent Samples
We looked at the t.test function for one sample and for paired samples in the last lab, you wont be surprised to
know that the same

OKANAGAN COLLEGE
Department of Mathematics and Statistics
STAT 124
BUSINESS STATISTICS
SOLUTIONS TO FINAL REVIEW
True or False
Question
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
Answer
F
F
T
F
T
T
F
F
Question Answer
(i)
T
(j)
F
(k)
F
(l)
T
(m)
T
(n)
T
(o)
T
(p)
F