STAT220 Problem Set 0
1.)
Questions. What is the difference between summary(sqrt(x) and sqrt(summary(x)?
Explain what order(x) and rank(x) produce.
summary(sqrt(x) first takes the square root of the case and then gives a summary on this new
case. Because
Lec5 2. April 27, 2005
Tests of Signicance
Outline:
General Procedure for Hypothesis Testing
Null and Alternative Hypotheses
Test Statistics
p-values
Interpretation of the Signicance Level
Tests for a Population Mean
Interpretation of p-values
Sta
3. The Big Bang.
Recessional Velocity (in km/sec)
1000
750
500
250
0
250
0.0
0.5
1.0
1.5
2.0
Distance (in megaparsecs)
The Universe began about ten billion years ago in a violent explosion; every particle
started rushing apart from every other particle in
Recessional Velocity (in km/sec)
1000
750
500
250
0
250
0.0
0.5
1.0
1.5
2.0
Distance (in megaparsecs)
The Universe began about ten billion years ago in a violent explosion; every particle
started rushing apart from every other particle in an early super-d
1 Calculations (5)
1. [5 pts] A survey in a given population has shown that 20% of the individuals in this population own an iPod, that 40% of the individuals own an
iPhone, but that 50% own neither an iPod nor an iPhone.
For a randomly sampled individual
Alice bets on the following shaded area.
Bob bets on the following shaded area.
Charles bets on the following shaded area.
1.00
1.00
1.00
0.75
0.75
0.75
0.50
0.50
0.50
0.25
0.25
0.25
0.00
0.00
0.00
0.25
0.50
0.75
1.00
0.00
0.00
0.25
0.50
0.75
1.00
0.00
0.
Lec5 3. April 29, 2005
The Power of a Statistical Test
Denition
Ways to Increase the Power
Two Types of Error Revisited
1
The power of a statistical test
The power of a signicance test measures its
ability to detect an alternative hypothesis.
The power
Homework 1 (Due Friday, January 15, 2016)
STAT 220 Winter 2016
Reminder: Students may discuss concepts and approaches for these problems together. However,
each student is responsible for submitting solutions of their own original work. Show all work
and
STAT 220 Winter 2016
Homework 4 (Due Friday, February 5, 2016)
Reminder:
Students may discuss concepts and approaches for these problems together. However,
each student is responsible for submitting solutions of their own original work. Show all work
and
STAT 220, Winter 2016
Reminder:
Homework 0 (due January 8, 2016)
Although discussion of problems and approaches is allowed, each student is responsible
for submitting their own original work. Please submit responses for exercises 15. Be sure to keep
your
STAT22000, Winter 2014 Homework 1
All page, section, and exercise numbers below are for the course text (Moore, McCabe and Craig,
Introduction to the Practice of Statistics, 7th edition).
Reading: Section 1.1-1.3
Problems for Self-Study: (Do Not Turn In.
STAT22000, Winter 2014 Homework 2
All page, section, and exercise numbers below are for the course text (Moore, McCabe and Craig,
Introduction to the Practice of Statistics, 7th edition).
Reading: Section 2.12.4
Problems for Self-Study: (Do Not Turn In. S
Joe Geyer
Homework 3
1.)
24 Oct. 2014
a) The experimental units are the undergraduate students. There are 40 total
experimental units.
b) The drivers reaction time is the response variable being measured.
c) The treatments factor was the use of a hands-fr
Joe Geyer
Homework 2
2014
17 Oct.
1.) (a)
z = (x - ) / = (88 72) / 13.2 = 1.21 standard deviations from the mean
According to the standard normal distribution table, this z value correlates to .88686
1 - 0.88686 = 0.11314
0.11314 * 73 (total students) = 8
Joe Geyer
STAT220 Problem Set 1
1. (a)
nclass=100 in graph used to answer the questions
(i) The distribution is fairly symmetric with a center near 60 ms.
false
(ii) The distribution is skewed to the left.
false
(iii) The distribution is skewed to the rig
STAT22000, Winter 2014 Homework 7
All page, section, and exercise numbers below are for the course text (Moore, McCabe and Craig,
Introduction to the Practice of Statistics, 7th edition).
Reading: Section 7.2, 8.1, 8.2, 9.1 and 9.2
Problems for Self-Study
STAT22000, Winter 2014 Homework 8
All page, section, and exercise numbers below are for the course text (Moore, McCabe and Craig,
Introduction to the Practice of Statistics, 7th edition).
Reading: Section 10.1 10.2, 11.1 and 11.2
Problems to Turn In:
1. (
STAT22000, Winter 2014 Homework 6
All page, section, and exercise numbers below are for the course text (Moore, McCabe and Craig,
Introduction to the Practice of Statistics, 7th edition).
Reading: Section 6.2, 6.4 and 7.1
Problems for Self-Study: (Do Not
STAT22000, Winter 2014 Homework 5
All page, section, and exercise numbers below are for the course text (Moore, McCabe and Craig,
Introduction to the Practice of Statistics, 7th edition).
Reading: Section 5.1, 5.2, 6.1
Problems for Self-Study: (Do Not Tur
STAT22000, Winter 2014 Homework 4
All page, section, and exercise numbers below are for the course text (Moore, McCabe and Craig,
Introduction to the Practice of Statistics, 7th edition).
Reading: Section 4.1, 4.2, 4.3, 4.5
Problems for Self-Study: (Do No
STAT22000, Winter 2014 Homework 3
All page, section, and exercise numbers below are for the course text (Moore, McCabe and Craig,
Introduction to the Practice of Statistics, 7th edition).
Reading: Section 2.6, 3.13.4
Problems for Self-Study: (Do Not Turn
STAT 220 Winter 2016
Homework 2 (Due Friday, January 22, 2016)
Reminder: Students may discuss concepts and approaches for these problems together. However,
each student is responsible for submitting solutions of their own
original
work.
Show all work
and
Lec1-1, Spring, 2005
STAT 220E, Spring, 2005
1
Displaying Distributions with
Graphs
Outline
Individuals and Variables
Categorical and Quantitative Variables
Exploratory data analysis
Categorical variable analysis
Pie charts.
Bar graphs
Pareto chart
I.
Calculations (5)
1. [5 pts] A survey in a given population has shown that 20% of the individuals in this population
own an iPod, that 40% of the individuals own an iPhone, but that 50% own neither an iPod
nor an iPhone.
For a randomly sampled individua
Stat220, Fall 2011
Practice Midterm Questions
1. Jude and his wife are having trouble choosing a name for their baby daughter. They have
narrowed the choices to Michelle, Julia, Penny, or Rita. They decide to ask their friends to
choose their favorite nam
Homework Solutions 8, STAT 22000
Walter Dempsey
Problem 8.38
: Bicycle accidents and alcohol
(a)
542
Descriptive statistics should include proportions such as 1711 0.32 tested positive for alcohol out of
the total number of records. Moreover, the data is