Chapter 9 Sampling
Distributions
Two key ideas:
1.
A statistic is a random variable, the value of which varies from
experiment to experiment or sample to sample
2.
As a random variable, it has a sampling distribution with a mean
and standard deviation tha
Chapter 10 Introduction to
Inference
Statistical inference provides methods for
drawing conclusions about a population
from sample data using probability to
express the strength of our conclusions
We use formal inference only when data
are produced by a
Statistics
Lecture
Colin Wang
September 26, 2013
Probability
Law of Large Numbers (LLN): The relative frequency of an outcome converges to a number
(the probability of outcome) as the number of observations increases.
Random experiments:
Repeatable, eve
Ch. 11 Inference for Means
11.1 Inference for the Mean of a Population
http:/www.cliffsnotes.com/math/statistics/univariate-inferential-tests/one-sample-z-test
How do we estimate an unknown ?
Its no real surprise, that we estimate /n with.s/n
where s is t
Chapter 12 Inference for
Proportions
https:/faculty.etsu.edu/gardnerr/1530/Chapter20.pdf
We are still interested in inference, but
our parameter of interest is changing
from a mean to a proportion.
12.1 Inference for a Population
Proportion
Sampling distr