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Mean
Population
Standard
Deviation
Sampling
Distribution
Y =
Sample
Standard
Error
s
Y
n
Shape of Distribution
Any Shape.
When specified as a normal
distribution, Z table can be
used to find out the proportion
of population within a range of
values.
Alway
SOC 46B Midterm 1 Study Guide
Sampling and Measurement
1. Types of statistics
a. Descriptive statistics = describe
i. Summarize the information in a collection of data (i.e. mean, median, mode)
b. Inferential statistics = predict
i. Use information from a
Inclassexercise
46B
Dr.Shu
1. Findtheprobabilitiesforthesesmallsampletvalues:
a. Morethant=2,withn=20.
b. Lessthant=2,withn=16.
c. Betweent=2andt=2.7,withn=41
d. Lessthant=0,withn=6.
2. Findthetscoreforthefollowingprobabilities:
a. 95%CIwithn=26.
b. 90%CI
Inclassexercise
Sociology46B
Dr.Shu
1. FindtheZscorestoconstructthefollowingconfidenceintervals:
a. 90%
b. 95%
c. 99%
d. 99.9%
2. Researchershypothesizethatinadditiontobenefitingstudentsacademically,schoolsalsobenefit
lowincomestudentsintheirhealthastheya
Welcome!
Course Overview
Introductions
Syllabus
Why should we study statistics?
Teaching team
1
Discussion sections/labs
Fridays in Hutchison 93 (basement)
NO SECTION TOMORROW
Purpose
Review material
Practice skills
Stata
Attendance
Homework
Pu
10/6/2014
Types of statistics: Descriptive and inferential
Populations vs. samples
Parameters vs. statistics
Collecting data
Sampling
Bias
Variables and measurement
Descriptive statistics: Describe
Summarize the information in a collection of data
E
Lecture 3: Describing Data with Tables
and Graphs
Tables
Graphs or charts
Source: The Onion
Distribution Shapes
http:/www.theonion.com/articles/whatsourcatplotting,32457/
Tables:
Simple Frequency Distributions
A table that lists all the possible cat
10/13/2014
Lecture 4
Measures of Central Tendency
Measures of Central Tendency
These statistics show what a typical observation in our
data set looks like.
3 common measures of central tendency:
Mode
Mean
Median
The ideal measure of central tendency for a
Probability
Probability distributions
Discrete
Continuous
The normal probability distribution
Zscores and the Z table
Everyday we make judgments based on
probability:
There is a 2% chance of winning a lottery scratch
off game.
There is a 60% chance of ra
10/15/2014
Lecture 5
Measures of Dispersion
and Variation
Measures of Variation
Measures of central tendency describe the typical values of a
frequency distribution. We need measures of variation to describe
the spread of the data about that typical value
LECTURE 7
Population, Sample and Sampling Distributions
Lecture 7: Overview
Sampling Distributions
Definition and properties
Exercise: Creating a sampling distribution
The Central Limit Theorem
Distinguishing between population, sample and
sampling distri
10/27/2014
Lecture 8:
Reviewing Probability
and Distributions
Last week we covered:
The logic of probability
Probability distributions
Discrete
Continuous
Zscores and the ztable
Sampling distributions
The Central Limit Theorem
Distinguishing between

3. You are interested in a used car. Your friend who is very knowledgable about vehicles thinks the
probability distribution of the worth of the car is as follows. Do you think it is a good deal if you
purchase the car at a price of $4,500?
Price
Probab
lelass Exercise
Sociology 463
Dr. Sim
1. Find measures of variation for the foiluwing distributions:
ii. A sampleoflUi11dividuaI
s rrpoﬁcd the number ofchildt'cn they had as 13
113,110,032 1,:
18 following:
b:
IIGHEST YEAR OF SCHOOL COMPLETEE
—
1
2
4
1
lelass Exercise
Sociology 463
Dr. Sim
1. Find measures of variation for the foiluwing distributions:
ii. A sampleoflUi11dividuaI
s rrpoﬁcd the number ofchildt'cn they had as 13
113,110,032 1,:
18 following:
b:
IIGHEST YEAR OF SCHOOL COMPLETEE
—
1
2
4
1
Assignment 2
Sociology 46B
Introduction to Social Research
Fall 2015
Due on Oct. 15, 2015
Name_
ID # _
(15 points)
1. The following table shows the 2011 murder rates (per 100,000 population) for the
fifteen largest cities in the United States. Calculate t
Assignment 1
Sociology 46B
Introduction to Social Research
Fall 2015
Due on Oct. 8, 2015
Name_
(20 points, 4 points each for a.d.)
1. Read the article by Warr (1989) and answer the following questions.
a. Describe the population.
b. Describe the sampling
SOC 46B FINAL STUDY GUIDE
Confidence Intervals for a Small Sample Mean
1. Confidence intervals: review
a. Using the zdistribution to estimate confidence intervals is a good choice under two conditions:
i. Our population standard deviation is known
1. And