1. As part of a survey of college students a researcher is interested in the variable class
standing. She
records a 1 if the student is a freshman, a 2 if the student is a sophomore, a 3 if the student is a junior, and
a 4 if the student is a senior. The
Central Limit Theorem
If a random sample of size n is selected from
ANY population with mean m and standard
deviation f , then when n is large the
sampling distribution of the sample mean X
is approximately Normal:
is approximately N(,
/)
n
X
No matter wh
Syllabus:
Elementary Statistics for Social Sciences (STAT 2053 SEC 001)
Fall 2011
Instructor-Thagendra Timsina
Email - [email protected]
Office & hours
MSCS 309 & MW 11:30 am 12:30 pm and by appointment
Time and Classroom
TH 10:30 11:45 & Agri
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STAT 2053 Elementary Statistics
Chapter 10 Introducing
Probability
Idea of Probability
Probability is the science of chance
behavior
Chance behavior is unpredictable in the
short run but has a regular and
predictable pattern in the long run
this is why
STAT 2053 Elementary
Statistics
Chapters 9 Producing Data:
Experiments
1
Chapter 9
Chapter 8 focused on proper techniques to
gather data through observation and
questioning. The techniques described do
not influence any of the individuals in the
sample; t
STAT 2053 Elementary
Statistics
Chapter 14 Introduction to Inference
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9/23/11
Inference
We have learned several different
properties of data and different rules of
probability.
We can now use these properties to make
con
Tests of Significance
The second inference method discussed in Chapter
14 is called tests of significance.
When we conduct these tests, we re going to have
some claim about our population, and we re going
to see if the data supports or refutes that claim.
Case Study II
Studying Job Satisfaction
Obj100
Suppose job satisfaction scores follow a
Normal distribution with standard deviation =
60. Data from 18 workers gave a sample mean
score of 17. If the null hypothesis of no average
difference in job satisfact
STAT 2053 Elementary
Statistics
Chapter 19 Inference about
a Population Proportion
Chapter 19 - Proportions
Until now, we had been working with population
means.
Chapters 19 and 20 focus on inferences about
populations proportions (The percent of our
whol
STAT 2053 Elementary
Statistics
Chapter 19 Inference about a Population Proportion
Part 2
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9/23/11
11
Finding the Sample Size
The margin of error involves the sample
proportion. Well have to make a guess
on this value wh
STAT 2053 Elementary Statistics
Chapter 11 Sampling Distribtions
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9/23/11
Chapter 11
This chapter focuses on how we use data collected
from a sample to find out information about the
whole population.
The nature of rando
STAT 2053 Elementary
Statistics
Chapter 12 General Rules of
Probability
Probability Rules from
Chapter 10 of
Chapter 12 focuses on some other rules
probability that we didnt cover in Chapter 10.
To recap:
Chapter 12
2
Venn Diagrams
Definition: For a rando
STAT 2053 Elementary Statistics
Chapter 13 Binomial Distributions
1
Chapter 13
Example: Suppose you take an exam that
consists of 10 multiple choice questions,
each with 4 possible answers. You havent
studied, so you randomly guess on all 10
questions. Ho
STAT 2053 Elementary Statistics
Chapters 15 Thinking about Inference
1
Thinking about Inference
In Chapter 15 we go a little further into the specifics
of confidence intervals and significance tests.
We will also start to stray away from the assumptions
t
STAT 2053 Elementary Statistics
Chapter 17 Inference about a Population Mean
1
Chapter 17
This chapter revisits confidence intervals and tests of
significance for . This time though, we no longer
assume that we know the population standard
deviation, .
Th