Week 3: Probability Theory
What Is Probability
Beyond the Basics: Chi-square
What Is Probability
Probability (P) is always expressed as a value between
0 and 1 (0% to 100%).
Probability is the likelihood that a
Collecting, Organizing and
What Is Statistics?
Statistics helps us make decisions
without prejudice - data is
Statistics is a process involving the
collection, organization, analysis
and interpretation of data to make
Week 5: Normal Distributions
of Normal Distributions
Standard Units and Areas
Areas Under the Normal Curve
Continuous Random Variable
outcome of an experiment
Weight of a student
Week 4: Probability Distributions
Random Variables and Probability Distributions
Experiment - a process by which an
observation or measurement is obtained
The quantitative variable x is random when its
Week 7: Hypothesis Testing
A Statistical Hypothesis
A claim about a population.
Null hypothesis H0
Alternative hypothesis Ha
Statistical hypothesis that
contains a statement of equality, contains a statement of
inequality, such as <, or >.
Week 6: Confidence Intervals
Introduction to Estimation
Statistics are used to make inferences about a population from a sample.
Samples and Populations
experience by way of sampling helps us
make decisions a
Linear Regression and
Organizing Ordered Pairs of
regression involve the
study of ordered pairs
This data, expressed as
(x,y) is usually first
presented in table form
Store Customers Sales
<- when I have x value or z value I use top
Question 1. The ages of a group of 50 women are approx normally distributed with a mean of 51 years and a standard
deviation of 5 years. One woman is randomly selected from the group and her age is observed.
a. Find the probability that her age will fall
Project Part C:
The data used for the analysis of this project is the AJ Davis Department Stores Data.
AJ DAVIS is a department store chain, which has many credit customers. It wants to
analyze the data to find out relevant information about