Question 1
(1) True/False: The regression model Y = b0 + b1*X1 + b2*X2 + e is a simple linear regression
model.
TRUE. The linear regression model can always be written in the form:
Y b0 b1 X 1 b2 X 2 K bn X n e
where
For
X 1 , X 2 ,K , X n
n2
are independ
PREDICT 420. Individual Assignment 1: Working with Files
Memo from January 2010. Sorry to lay this on you so late in the game (and perhaps,
make you this weekend), but the team needs your help in generating the
Assignment #2: Regression Model Building
PREDICT 410
Data: The data for this assignment is the Ames, Iowa housing data set. This data will be made available
by your instructor.
Assignment Tasks
In this assignment we will begin building regression models f
Assignment #1: Getting to Know Your Data
PREDICT 410
Data: The data for this assignment is the Ames, Iowa housing data set. This data will be made available
by your instructor.
Introduction:
Before we can begin to build statistical models, we will always
Mod 3 Practice KEY
True/False
1. _True_The dependent variable is the variable that is being
described, predicted, or controlled.
2. _True _A simple linear regression model is an equation that
describes the straight-line relationship between a dependent va
Multiple Regression
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Some images may be included under fair use guidelines (educational purposes)
Mult
Normal distribution
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Norm
Difference in two means
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Case Study:
Treating Chronic
Fatigue Syndrome
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152
CHAPTER 5
Regression
(a) What are the slope and intercept of the regression line of the husbands height
on the wifes height in young couples?
(b) Draw a graph of this regression line for heights of wives between 56 and 72
inches. Predict the height of
Due by 11.59 pm July 13th
Chapter 7
Continuous Probability Distributions
Chapter 8
Sampling Distributions &Estimation
Chapter 9
One-Sample Hypothesis Tests
Assignment
Please provide detailed solutions to the following problems/exercises (4 problems/exerci
Obtaining Access to SAS Studio
on the NU Social Sciences Computing Cluster (SSCC)
(1) Visit the NU Social Sciences Computing Cluster (SSCC) index page.
http:/www.it.northwestern.edu/research/user-services/sscc/index.html
(2) Apply for a SSCC account Reque
PREDICT 455-DL Section 56: Data Visualization
Thom as W . Miller, Ph.D.
[email protected]
Spring 2016
TA: Kathryn (Khaki) Daugherty
[email protected]
Course Description
This course begins with a review of human perception and cogniti
Week 4
Objectives
1. Explain what is a probability density function for a continuous variable.
2. Plot a cumulative distribution function and compute probabilities.
3. Compute the expected mean value and variance.
4. Describe a standard normal distributio
Individual Assignment 5
Messy Data Paper
The story so far
Concerned about usage trends, executives at Yahoo! are hoping that you will
be available to serve as an outside consultant to the firm. First, they would like
you to provide a summary of what you h
Individual Assignment 2
Accessing and Manipulating Relational Data
Did you get the memo?
The business analysts are working on a
model for customer lifetime value (CLV)
analysis. They are looking at total
revenues and costs associated with each
customer. T
One-sample mean with the tdistribution
Slides developed by Mine etinkaya-Rundel of OpenIntro & Edited by Arend M Kuyper
The slides may be copied, edited, and/or shared via the CC BY-SA license
Some images may be included under fair use guidelines (educati
Thomas Northcut/Getty
C H A P T E R 14
Introduction
to Inference
IN THIS CHAPTER
WE COVER.
After we have selected a sample, we know the responses of the individuals in the
sample. The usual reason for taking a sample is not to learn about the individuals
c Jupiterimages/Age fotostock
C H A P T E R 15
Thinking about
Inference
IN THIS CHAPTER
WE COVER.
To this point, we have met just two procedures for statistical inference. Both
concern inference about the mean of a population when the simple conditions (p
116
CHAPTER 4
Scatterplots and Correlation
(a) Make a scatterplot of these data. Based on the scatterplot, do you expect the
correlation to be positive or negative? Near 1 or not?
(b) Find the correlation r between the heights of the men and women. Do the
Chapter 1 Exercises
Percent Distribution of Hispanics
by Type: 2006
Puerto Rican
Cuban
Central American
South American
Mexican
Other Hispanic
1.29 Spam. Email spam is the curse of the Internet. Here is a compilation of the most
common types of spam:18
Typ
Finding a value given a proportion
Step 3. Use the table. Follow the picture (we added the z-scores to the picture label
to help you):
area between 1.46 and 0.99 = (area left of 0.99) (area left of 1.46)
= 0.1611 0.0721 = 0.0890
About 9% of high school s
Population versus sample
the population we want to describe. Which age groups will we include? Will we include illegal immigrants or people in prisons? The CPS defines its population as all
U.S. residents (legal or not) 16 years of age and over who are c
Kolvenbach/Alamy
C H A P T E R 19
Inference about a
Population Proportion
IN THIS CHAPTER
WE COVER.
Our discussion of statistical inference to this point has concerned making inferences about population means. Now we turn to questions about the proportion
Factor B
Repetitions
1 time
3 times
5 times
30
seconds
1
2
3
90
seconds
4
5
6
Subjects, factors, treatments
Subjects assigned to Treatment
3 see a 30-second ad five
times during the program.
Factor A
Length
F I G U R E 9.2
The treatments in the experimen
Bruce Coleman/Alamy
C H A P T E R 11
Sampling Distributions
IN THIS CHAPTER
WE COVER.
What is the average income of American households? Each March, the governments Current Population Survey asks detailed questions about income. The
98,105 households cont
Solutions for HW3
5.32.
(a) The slope is b = ! /! = (0.6)(8)/(30) = 0.16, and the intercept is = = 30.2.
(b) Julies predicted score is = 78.2.
(c) ! = 0.36; only 36% of the variability in y is accounted for by the regression, so the
estimate = 7
Solutions for Homework #4
Chapter 10
10.14.
(a) P(Y 0.4) = 0.4.
(b) P(Y < 0.4) = 0.4.
(c) P(0.3 Y 0.5) = 0.2.
10.44.
(a)
X is discrete, because it has a finite sample space.
(b)
At least one nonword error is the event cfw_X 1 (or cfw_X > 0). P(X 1) = 1 P(
STAT 202 Homework 4 Solutions
8.1. (a) The population is (all) college students. (b) The sample is the 104 students at the
researchers college.
8.6. Number from 01 to 33 alphabetically (down the columns). With the applet:
Population = 1 to 33, select a sa
Solutions for HW2
3.13.
(a) Search Table A for 0.20: z = 0.84 (software gives 0.8416).
(b) Search Table A for 0.60: z = 0.25 (software: 0.2533).
3.32.
(a) Less than 2% of runners have heart rates above 130 bpm: for the N (104, 12.5) distribution,
x > 130