Unit 2 Test Review
MR. LINDSEY
Find the probability of event B
A computer is used to select randomly a number
between 1 and 2000. Event B is selecting a number
less than 200
199/2000 or .0995
Find the probability of event B
Event B is rolling a 6, 3, o
Basic Concepts of Probability
Cited
Larson, R. & Farber, B. Elementary Statistics
Picturing the World, 1st ; Prentice-Hall: New
Jersey, 2000; pages 104-110
Intro
This surgery has a 20% chance of being
successful
There is a 90% chance of rain today.
Def
A conditional probability is the probability of
an event occurring, given that another event
has already occurred. The conditional
probability of even B occurring, given that
event A has occurred, is denoted by P(B|A)
and is read as probability of B, giv
The Addition Rule
Mutually Exclusive Events
Two events A and B are mutually exclusive if A
and B cannot occur at the same time
Decide if the events are mutually
exclusive.
1. Roll a die. A: Roll a 3. B: Roll a 4
2. Select a student. A: select a male stud
Analyzing Categorical Data
Probability and Statistics
Frequency
Frequency Table
Relative Frequency Table
Shoe Brands
Counts of
students
Shoe Brands
Percent of
students
Nike
300
Nike
35.71
Adidas
50
Adidas
5.95
Puma
3
Puma
.36
Reebok
2
Reebok
.24
Asics
75
Frequency Distributions
and Their Graphs
Probability and Statistics
A frequency distribution is a table that
shows classes or intervals of data entries
with a count of the number of entries in
each class. The frequency, f, of a class is
the number of data
Unit 1 Test
PROBABILITY AND STATISTICS
Is the collection of all outcomes,
responses, measurements or
counts that are of interest.
POPULATION
Is a numerical description of a
sample characteristic.
STATISTIC
Is a subset of a population.
SAMPLE
Consist of in
Normal Distributions
Probability and Statistics
Which of the following can be a
normal distribution, why?
Which of the following can be a
normal distribution, why?
Question 2
If a random variable is normally distributed,
approximately 95% of the populati
Math review
1) Given: P(A) = .2 and P(B|A)=.5
Find: P(A and B)
2) Given: P(C)=.3 and P(D) =.5 and P(C and D) =.1
Find: P(C or D)
Introduction to Normal
Distributions
Normal Distribution
A normal distribution is a continuous probability
distribution for a
AN OVERVIEW OF STATISTICS
Learning Objectives
The definition of statistics.
How to distinguish between a population and a
sample and between a parameter and a statistic.
How to distinguish between descriptive statistics
and inferential statistics
Why s
Lesson Target
I will be able to distinguish between
qualitative data and quantitative data
I will be able to classify data with respect
to the four levels of measurement:
Nominal
Ordinal
Interval
Ratio
Types of Data
Data sets can my classified in two
I will know how to design a statistical study
I will know how to collect data by performing
an experiment, using a simulation, taking a
census, or using a sampling
I will know how to create a sample using
random sampling, stratified sampling, cluster
sam
Measures of Central Tendency
Mean, Median, and Mode
a measure of central tendency is a value that
represents a typical, or central, entry of a data
set. The 3 most commonly used measures of
central tendency are the mean, the median,
and the mode.
Mean
T
Measures of Variation
Math Review
Give the level of measurement for each data
set:
1) A list of social security numbers.
2) A list of salaries.
3) A list of the top 5 college basketball teams.
Calculate the means of the following
data sets.
Data set