Kanika Krista Gandhi
Lab Assignment #2
Due: September 23rd 27th, 2013
Measures of Central Tendency
This assignment asks you to review the GSS datasets and describe the data using
measures of central t
Statistics 1100, Fall 2011
Homework #1 ANSWERS
1.
Identify the level of measurement most appropriate for the following variables:
a.
Yearly income (High, Medium, Low)
b.
The speed that a vehicle is mo
Example 4:
We want to know if the weight of adolescent girls in a population has changed over time
Population mean weight of girls 30 years ago was 60 kilos
We have no firm expectations about the d
Key Concepts
Description and inference
Description: summarizing data to describe subjects or objects of interest.
Inference: drawing conclusions regarding the relationships between attributes of
int
Describing the distribution of interval (continuous) variables
Frequency distributions
Missing values
Values well out of the range are used to represent missing values
Shows up on frequency distrib
Point estimate
Central limit theorem tells us that the sample mean is an unbiased estimator of the
population mean
Sampling distribution centred on the population parameter
Sample mean is also an
Can express how close y(bar) is to in probabilistic terms
Sampling distribution of all y(bar) for all samples of size n
Sampling distribution is normal
Will never know for sure if is in the interval
Probability
Definition
With a random sample or randomized experiment, the probability of an observation has
a particular outcome is the proportion of times that outcome would occur in a very long
seq
Z-score = ( y)/
Transform into standard normal distribution
Mean = 0
Standard deviation = 1
1
f ( z)=
z 2
exp
Z TABLE
Gives the area in the tail or tails of the distribution for selected values o
Statistics 1100, Fall 2011
Homework #2 ANSWERS
1.
STATA problem: Use the GSS 2002 data set (not the subsample of 40) and the variable
spend the evening with friends [short name: socfrend]. Be sure to
Statistics 1100, Fall 2011
Homework #3 ANSWERS
1.
A researcher suspects a link between age and support for abortion rights, and obtains the
following data:
Favors
abortion
rights
Age
-yes
young
no
old
Odds and odds ratios
Low birth weight and smoking
In the situations where we are interested in describing the prevalence of some condition in a
population or the chances of coming down with a conditi
The criterion function for obtaining point estimates a and b for the population paramaters
is based on the residual e
The residuals give the vertical distances between the fitted line and the actua
Kanika Gandhi
SOC 1100: Introductory Statistics for Social Research
Homework #1
September 20th, 2013
Variables, Frequencies, Measures of Central Tendency
1. Please answer the general discussion points
SOC 1100: Introductory Statistics for Social Research
Lab Assignment #1
Due: September 23rd September 27th, 2013
Describing Data
This assignment asks you to review the GSS dataset and begin to describ
LECTURE 1 Samples
Key Concepts
Variables
Quantitative
Measurement scale has numerical values
o Interval scale
Specific numerical distance or interval between them
o Discrete or continuous
Continuou
Only makes sense when talking about ordinal variables
Table 1
Low Health
High Health
Low Happiness
Joe, Jane, Mary and Bob
4
0
High Happiness
0
Tim, Jack, Bill and Sue
4
Example of perfect positive re
Example 1:
Do TAs and Instructors of TAs differ in their perceptions of how often miscommunication
occurred?
H0:
Ha:
(TA)= ( prof ) (under the null hypothesis, difference is 0)
(TA) ( prof )
Where d
Look at relationships between 2 distributions
Formula
y= + x
Formula for a straight line
Expresses the value of u as a linear function of the value of x in a bivariate population. The
formula defines
Sampling Distribution
For any population we can draw multiple, independent random samples of size n. We
call these samples n1, n2, n3, n4
In a sense hypothetical
Each sample will generate a mean
Dis
Example 1:
TA Hour Worked in a week - A Two Sided Test
Research question: Do TAs work an average of 20 hours per week?
Define hypotheses:
H0: = 0
Ha: 0
Current example
Null hypothesis: =20
Alternati
Example 1: An Alternative Test of Difference between 2 Proportions
2 x 2 table showing relationship between gender and voting in 2004 election
Question: Is there a relationship between gender and vo
Normal distribution and normal
curve
curve
SO 1100
September 28
Course Business
Exam 1 turned back in labs next week
Homework #4 posted on myCourses today
posted on myCourses
1
Outline for todays clas
10/1/2011
Standard normal table
normal table
SO 1100
September 30
Course business
Exam 1 handed back in labs next week
Go over answers in labs
Talk to TAs about any questions you have
1
10/1/2011
Toda
2-sample hypothesis testing
hypothesis testing
November 4
Todays class
(Review the concept of statistical
significance)
(Review 5 steps of hypothesis testing and
decisions we have to make at each step
Two sample proportions
and
Chi
Chi-square test (2 )
test
November 7
Class business
Exam 3 next Monday, November 14
TA office hours this week
Yara: Thursday 1-3pm
Mujun: Friday 1-3pm
Aisalkyn: Friday 1
Chi-square test (2 ) (cont)
test
(con
November 9
Class business
Class cancelled Wednesday, November 16
Exam 3 next Monday, November 14
TA office hours this week
Yara: Thursday 1-3pm
Mujun: Friday 1-3p
Sociology 1100: Introductory Statistics for Social Research
Fall 2011
Class Time: Monday/Wednesday/Friday 10:00 10:50 am
Class Location: 001 Salomon
Professor:
Office Hours:
Office:
Email:
TAs:
Email:
SO 1100
Introductory Statistics for
Social Research
Social Research
Fall 2011
Prof. Nancy Luke
Department of Sociology
of Sociology
September 7
Todays outline
Why statistics?
Professor and TAs
Course
Introduction to Research,
Variables and Data
Variables and Data
SO 1100
September 9
Course business
Computer labs start next week, Monday September
12
12
TAs will take attendance
1
Class survey
We wil