Conducting a Survey
Lecture 2
Three Sources of Bias
Sampling Bias
Bad samples
Not all individuals in the population were included in sampling.
Nonresponse Bias
Not interested; doesnt want to participate; not reaching the person.
Response Bias
No ab

Conducting a Survey
Lecture 5
To order food at a McDonalds restaurant, one must choose from
multiple lines, while at Wendys Restaurant, one enters a single line.
The following data represent the wait time (in minutes) in line for a
simple random sample of

Conducting a Survey
Lecture 6
Learn to use TI-84 compatible calculator to
compute the Basic statistics by using the One
Variable Statistics function.
If you dont have one, please download the
emulator to your computer.
If you have a similar calculator, pl

Conducting a Survey
Lecture 2
Organizing Quantitative Data
Discrete or Continuous
Such as people, cars, and books
Few different values
Many different values
Such as money, time, and distances
Treat them like categorical data:
Not likely that you will have

Lecture 7
Conducting a Survey
The Five-Number
Summary and Boxplots
The five-number summary of a data set:
Minimum, Q1,
M,
Q3,
Drawing a Boxplot
Step 1
Lower Fence = Q1 1.5(IQR)
Upper Fence = Q3 + 1.5(IQR)
where IQR = Q3 Q1
Step 2
Draw a number line long e

Probability
Lecture 11: Probability Concepts
Set Theory as in Venn Diagrams
Event C (100%)
Event E or
F(40%)
Event EF or F
(45%)
Event E and F
(10%)
Event C (100%)
Event E or
F(40%)
(75%)
Read as: The probability of E and F (or the intersection of E and F

Conditional Probability and Independence
1
There are four outcomes
when flipping 2 coins
cfw_H, H 25% cfw_H, T 25%
cfw_T, H 25% cfw_T, T 25%
50%
50% chances for
thechances for the
second coin is asecond
head. coin is a tail.
The probability of 2nd
coin is

Lecture 12
Aprobabilitymodellistsallthepossible
outcomesofanexperimentandeach
outcomesprobability.
Two general rules of a probability model:
1. No probability is greater than 1 or smaller than 0. 0
P(E) 1.
2. The sum of all probabilities of all outcomes

Lecture 8
Conducting a Survey
About the Least-squares
Regression
EXAMPLE
Finding an Equation that Describes Linearly Relate Data
Using the following sample data:
4-3
There are many different
regression lines by using
different points. Which
line is the be