Lecture Notes Part 16
Contrasts
Multiple comparisons
READING SS Sections 6.1-6.5
Part 16: Contrasts
A contrast is a specic linear combination of population means
that is chosen to compare one populati
Stat 5301: Homework 2 Solution
1. There is a stereotype that women are more talkative than men. A study examines this
stereotype and collects data on the speech habits of 42 women and 37 men in the Un
Stat 5301: Midterm 2
Tuesday, March 28, 2017
Name:
1. Please turn off cell phones and place them in your bag.
2. You may use one 2-sided 8.511 inch sheets of formulas (of your own making).
3. You may
HW 2
Gabriella Mickel
STAT 5301
February 8, 2016
Question 1. A company that sells running shoes online wants to compare two new marketing strategies. They will test the strategies on 10 weekdays. In t
Stat 5301: Homework 5 Solution
1. In a test for ESP (extrasensory perception), the experimenter looks at cards that are hidden
from the subject. Each card displays either a star, a circle, a wave, a s
STAT 5301 Autumn 2016, Homework 4
Due: Monday, October 3, 2016
Question 1. In a test for ESP (extrasensory perception), the experimenter looks at cards that
are hidden from the subject. Each card cont
STAT5301 Assignment 4
Due: September 30th, 2015
Answer all questions and submit the problems in order, making sure that the computer output and discussion
are placed together (do not put the computer
HW 5
Gabriella Mickel
STAT 5301
February 29, 2016
Question 1. In a test for ESP (extrasensory perception), the experimenter looks at cards
that are hidden from the subject. Each card contains either a
Lecture Notes Part 2
Density curves
Normal distribution
Scatterplot
Correlation
Least-squares regression
READING IPS Sections 1.3-2.3
Part 2: Density Curves
Descriptive statistics: We summarize only t
STAT 5301 Autumn 2016, Homework 2
Due: Wednesday, September 12, 2016
Question 1. There is a famous data set of iris measurements (sepal length and width, petal
length and width) for 50 flowers from ea
STAT 5301 Autumn 2016, Homework 5
Due: Monday, October 17, 2016
Question 1.
Suppose that 400 randomly selected alumni of the OSU were asked to rate the universitys
counseling services on a 1 to 10 sca
STAT 5301 Autumn 2016, Homework 5
Due: Monday, October 10, 2016
Question 1. The Survey of Study Habits and Attitudes (SSHA) is a psychological test, administered to students, that measures attitude to
Statistics 5301 Practice Midterm1 Questions
AU2012
1. Here are the 2007 health care expenditure per capita in the 35 countries with the
highest gross domestic product in 2007 in increasing order.
81
8
Sample Midterm 1 Solutions
PART I: Multiple Choice
1. A causal relationship can
(a) be determined using a voluntary response sample of subjects from the population of interest.
(b) be determined using
Kelly Mitchell
Homework 1
1. Define a new variable, 'monkey', that is the sequence of integers from -1 to 3. Display this
variable.
> monkey <- seq(-1, 3, 1)
> monkey
[1] -1 0 1 2 3
2. Check whether e
13.1 two-sample non-pooled t in R
I use the same t.test function as for the pooled t except that we go with the default
setting for unequal variances, var.equal = FALSE
I with this procedure, as with
Stat 5301 (Spring 2016)
Stat 5301 (Spring 2016)
Intermediate Data Analysis I
Associations and the simple linear regression model
Motivation: Forbes boiling point of water dataset
James B. Odei
The Oh
Stat 5301 (Spring 2016)
Stat 5301 (Spring 2016)
Intermediate Data Analysis I
Tests of significance/Hypothesis tests
Reading: The Statistical Sleuth (3ed), Chapter 1.
James B. Odei
The Ohio State Unive
Stat 5301 (Spring 2016)
Stat 5301 (Spring 2016)
Intermediate Data Analysis I
R Coding Review
What is R?
James B. Odei
The Ohio State University
Department of Statistics
404 Cockins Hall
1958 Neil Aven
Stat 5301 (Spring 2016)
Stat 5301 (Spring 2016)
Intermediate Data Analysis I
Probability
James B. Odei
Chance experiments
The Ohio State University
Department of Statistics
404 Cockins Hall
1958 Neil
11.2 inference about the population mean difference
I how would you estimate the common ?
I how many degrees of freedom?
1 Y
2 :
I so the standard error of Y
1 Y
2 ) =
SE (Y
Start of class 10/23/2017
12.2 back to two-sample: log transformation
(SS Display 3.8)
27 / 42
12.2 log transformation (contd)
I log transformation may make the normality and equal variances assumptions of the
pooled t-tools m
Stat 5301: Homework 2 Solution
1. There is a stereotype that women are more talkative than men. A study examines this
stereotype and collects data on the speech habits of 42 women and 37 men in the Un
Stat 5301: Homework 2.1 Solution
1. Milk is an important source of protein. How does the amount of protein in milk from a cow
vary with milk production? The article Metabolites of Nucleic Acid in Bovi
Stat 5301: Homework 5 Solution
1. In a test for ESP (extrasensory perception), the experimenter looks at cards that are hidden
from the subject. Each card displays either a star, a circle, a wave, a s
Stat 5301: Homework 4 Solution
1. All human blood can be ABO-typed as one of O, A, B, or AB, but the distribution of
the types varies a bit among groups of people. Here is the distribution of blood ty
Stat 5301
Lecture 6
Reading: IPS 4.3-4.4
1 / 37
random variables
I a random variable is a variable whose value is a numerical outcome of a random
phenomenon
I typically use capital letters (at the end
Stat 5301
Lecture 5
Reading: IPS 4.1, 4.2, 4.5
Toward Statistical Inference
> Example: Pew Research Study (August 916, 2016)
> Surveyed 2010 US. adults by random digit dialing
> Of these, 1587 (73%) w
12.1 robustness to departure from equal variances
I a major problem with unequal variances is that the pooled estimate of the common
standard deviation may not give a correct estimate of Y1 Y2
I a sim
Start of class 10/11/2017
Stat 5301 (Autumn 2017)
Mario Peruggia
Lecture 9 (Reading: IPS 6)
9.1 Power and Inference as a Decision
9.2 Use and Abuse of Tests
1 / 16
9.1 power
I Consider testing H0 vs.
Population: the entire group of individuals that we want information about. Sample: the part of the population we examine. Sampling
Frame: the list of individuals from which the sample is actually col
Stat 5301: Midterm 1
Monday, September 25, 2017
Name:
1. Please turn off cell phones and place them in your bag.
2. You may use one 2-sided 8.511 inch sheets of formulas (of your own making).
3. You m
7.2 example 1: multiple choice exam
Start of class 10/2/2017
I a multiple choice exam has 10 questions, each with five possible answers
I a student just guesses at all the answers
I let X be the numbe