Assignment 2 solutions
STAT 100
Spring 2015
total points =60
Last version: January 26th, 2015, 12:30pm.
1. Answer all three parts of exercise 2.4 in the textbook. (NOT MARKED.)
(a)
The sample size is 3722.
(b)
Online polls may not be reliable for a number
Stat100,Spring2011
Assignment 1
Note: Most of the questions below need no more than a sentence or two for an answer. 1. Do a web search on web poll. a. Remark on what sites predominate. Does it seem easy to gather data? In Google, most of the things that
Talking About Experiments
A recent study showed promising results in using IV
Immunoglobulin (IVIG) therapy to halt progression of
multiple sclerosis (MS). Dosages were set at 0.2 g/kg,
0.4 g/kg, and 0.8 g/kg.
Identify the response variable.
A.
B.
C.
IVIG
Question 1 [True-or-false Questions: 15 marks]
1-1.
T F (1 mark) We can think of the standard deviation as roughly the average distance
values fall from the mean. TRUE
1-2.
T F (1 mark) With a large, representative sample, the histogram is bound to follow
STAT 100 Fall 2014
Midterm 1 VERSION A
Instructor: Richard Lockhart
Name_
Student Number _
Instructions: This is a closed book exam. You may use a calculator. It is a 1 hour long exam.
It is out of 30 marks in total.
QUESTION 1 [10 marks in total]
For its
2/8/2017
Test:StatisticsConceptsandControversiesChapter10|Quizlet
NAME
4 Written questions
1. used to display distribution of categorical variable. always show parts of some whole
0%
INCORRECT
No answer given
THE ANSWER
pie chart
2. places and individual
2/8/2017
Test:StatisticsConceptsandControversiesChapter1|Quizlet
NAME
5 Written questions
1. Derivation between sample statistic and population parameter caused by chance in selecting a random sample. The
0%
margin of error in a confidence statement accou
2/8/2017
Test:StatisticsConceptsandControversiesChapter1|Quizlet
NAME
5 Written questions
1. Observes individuals and measures variables of interest but does not attempt to influence the responses
0%
INCORRECT
No answer given
THE ANSWER
Observational Stud
2/8/2017
Test:Statistics:ConceptsandControversies:Chapters3&4|Quizlet
NAME
5 Written questions
1. Has two parts: margin of error, and level of confidence.
Its conclusion applies to the population, not the sample.
2. Use random sampling.
3. Wording of the
2/8/2017
Test:StatisticsConceptsandControversiesChapter5|Quizlet
NAME
5 Written questions
1. Any specific experimental condition that is applied to the subjects. If an experiment has several explanatory variables, this
0%
is a combination of specific valu
2/8/2017
Test:Statistics:Concepts&ControversiesChapters3and4|Quizlet
NAME
5 Written questions
0%
1. They reduce bias
INCORRECT
No answer given
THE ANSWER
Advantages of random samples
2. we can't trust any of the single results
INCORRECT
No answer given
TH
2/8/2017
Test:StatisticsConceptsandControversiesChapter1|Quizlet
NAME
5 Written questions
1. Observes individuals and measures variables of interest but does not attempt to influence the responses
2. Errors not related to the act of selecting a sample
3.
2/8/2017
Test:StatisticsConceptsandControversiesChapter5|Quizlet
NAME
5 Written questions
1. A variable that we think explains or causes changes in the response variable.
0%
INCORRECT
No answer given
THE ANSWER
explanatory variable
2. A medical experiment
2/8/2017
Test:Statistics:ConceptsandControversies:Chapters3&4|Quizlet
NAME
5 Written questions
0%
1. Has two parts: margin of error, and level of confidence.
Its conclusion applies to the population, not the sample.
INCORRECT
No answer given
THE ANSWER
Co
2/8/2017
Test:StatisticsConceptsandControversiesChapter1|Quizlet
NAME
5 Written questions
1. Derivation between sample statistic and population parameter caused by chance in selecting a random sample. The margin of error in
a confidence statement accounts
Stat 100, Fall 2014
Assignment 4
Due Thursday, 2 Oct, by noon in the Stat 100 drop box
Most answers require only a sentence or two. My answers sometimes list several possibilities
students only need to think of one reasonable one.
1. In the text
STAT 100, Fall 2014, Surrey Campus
Richard Lockhart, Instructor
Assignment 1
Due Thursday, 11 Sept, by noon in the Stat 100 drop box
Note: Most of the questions below need no more than a sentence or two for an answer.
1. Do a web search on w
Stat 100, Fall 2014
Assignment 7
Due Thursday, 23 Oct, by noon in the Stat 100 drop box
Most answers require only a sentence or two. In question 7 I am asking you to think critically
about an example in the text.
1. In the text Exercise 10.24. (Ha
STAT 100 Fall 2014
Midterm 1 VERSION B
Instructor: Richard Lockhart
Name_
Student Number _
Instructions: This is a closed book exam. You may use a calculator. It is a 1 hour long exam.
It is out of 30 marks in total.
QUESTION 1 [2 marks in total]
Multiple
STAT 100 Final Exam
STAT 100 Fall 2014
Final Examination
Instructor: Richard Lockhart
Name_
Student Number _
Instructions: This is an open book exam; you are permitted notes, text, and other printed
material. You may use a calculator; computers are not
STAT 100 Midterm 2
STAT 100 Fall 2014
Midterm 2 VERSION A Solutions
Instructor: Richard Lockhart
Name_
Student Number _
Instructions: This is a closed book exam but you are perm
STAT 100 Midterm 2
STAT 100 Fall 2014
Midterm 2 VERSION B Solutions
Instructor: Richard Lockhart
Name_
Student Number _
Instructions: This is a closed book exam but you are perm
Stat 100, Fall 2014
Assignment 5
Due Thursday, 9 Oct, by noon in the Stat 100 drop box
Most answers require only a sentence or two.
1. In 2010 there were 21,055 new cancer cases in British Columbia while there were 14,650
new cases in Alberta. Whi
Stat 100, Fall 2014
Assignment 9
Due Thursday, 13 Nov, by noon in the Stat 100 drop box
Most answers require only a sentence or two.
1. In the text Exercise 14.22.
The psychologist means that productive researchers have neither better nor worse
te
Stat 100, Fall 2014
Assignment 11
This assignment is not to be handed in to be marked. I will post solutions to the assignment
next Monday night, Dec 1, so that you can check your answers and ask me if you have any
questions.
Most answers require
Stat 100, Fall 2014
Assignment 10
Due Thursday, 20 Nov, by noon in the Stat 100 drop box
Most answers require only a sentence or two.
1. In the text Exercise 15.8
A slope of b=0.101 means that each added IQ point predicts an increase of 0.1 points
Stat 100, Fall 2014
Assignment 2
Due Thursday, 18 Sept, by noon in the Stat 100 drop box. For Question 1 there is a component to
be done through Top Hat by Monday 15 September at 6PM.
Note: Most of the questions below need no more than a sentence
Stat 100, Fall 2014
Assignment 3
Due Thursday, 25 Sept, by noon in the Stat 100 drop box.
Note: Most of the questions below need no more than a sentence or two for an answer.
1. Imagine Translink sends a couple of uniformed employees to stand outs
Stat 100, Fall 2014
Assignment 8 Solutions
Due Thursday, 6 Nov, by noon in the Stat 100 drop box
Most answers require only a sentence or two.
1. In the text Exercise 12.20.
For part (a) the city needs the mean income because from the mean and the
Stat 100, Fall 2014
Assignment 6
Due Thursday, 16 Oct, by noon in the Stat 100 drop box
Most answers require only a sentence or two.
1. In the text Exercise 9.8.
With a crew of 1000 there would be 2000 people on board. That would mean 111 cups
of
17
Randomness
A phenomenon is random if individual outcomes cannot be predicted with certainly, but there is a
predictable distribution of outcomes in the long term.
50%.
Probability
The probability of an outcome describes the proportion of times t
14 Scatterplot
Histogram quantitative variable quantitative
variable histogram
Scatterplot
5
0
10
10
0
15
Horsep
15 ower
20
0
0
Gas
Mileage
20
25
25
0
30
30
0
Scatterplot
A scatterplot is a graph that shows the relationship between two quantitative vari
Chapter 5 experiment
Subjects: the individuals studied in an experiment
A treatment is any specific experimental condition applied to the subjects.
- If an experiment has several explanatory variables, a treatment is a combination of specific values of
th
Chapter 11
numerical variables
1.Histogram: bar graph
Histogram
numerical variable x
x
Bar graph
Categorical variable
Making histograms (categorizing a continuous variable)
-Divide the range of the data into classes of equal width
To ensure that a v