1. Examples Sampling, Biased vs. Unbiased
For each problem below. Name the type of sampling used.
An employer requests 20 volunteers to answer the questions
on a survey.
A teacher asks every 4th person in their class to answer
survey questions.
A high school football coach asks all the seniors on the team
to respond to a group of questions.
A student asks the people sitting with them at lunch to
fill out a survey.
A teacher uses a computer to randomly select 30 of their
students to respond to survey questions.
For each sentence below, indicate whether the statement is
biased or unbiased.
What is your favorite extra curricular activity?
7. Wouldn’t it be better if teachers assigned less homework?

2. Types of Sampling/Biased vs. Unbiased Statements
For each problem below. Name the type of sampling used.
A company asks every 4th employee that works for them.
A company sends out surveys through and requests their customers to respond.
A company asks only the employees with 10 or more years of experience to take a
survey.
A company randomly selects 100 of their employees to answer questions on a survey.
A company asks only the employees that are present on the day the surveys are printed
to take the survey.
A principal asks 100 randomly chosen freshman, sophomores, juniors, and seniors to take
a survey.
A teacher uses a random number generator on their computer to select 50 of their students
to take a survey.
A subdivision asks the opinions of all the people that live on a specific street in the subdivision.
A coach asks every 4th player that shows up to practice to answer the questions on a short
A student asks 20 people in their class the questions on a survey.
The cafeteria in a high school asks for 100 volunteers to fill out a survey about the quality
of the food served.
12. A teacher selects 10 boys and 10 girls in their class to fill out a short survey.

3. Types of Sampling/Biased vs. Unbiased Statements
For each sentence below, indicate whether the statement is
biased or unbiased.
What do you think about the condition of the state’s roadways?
Don’t you think that the state should adopt a lottery for education?
. Do you believe that the tardy policy should be changed since the existing one is too
lenient?
What is your favorite type of car?
Do you believe that Almost There Tests should be eliminated completely?
Do you believe the school calendar should be changed so that students get more time off?
What do you think of the current attendance policy?

4. Measures of Spread Practice
For the following sets of data numbers:
List them from least to greatest.
Find the mean, standard deviation, and variance
87,87, 20, 80, 60, 80, 60, 80, 87, 82, 87 a.
b. Mean =
Standard Deviation=
Variance =
Range =
2. 80,80,74,93,87,34,80,93,100,93,80,87
3. 72,80,76,80,74,115,96,84,92,48,88,80,80
4. 69,86,34,99,60,95,96,74,84,93
,12,97,64,70,64,100,91,94,56,71
,97,45,89,38,86,87,93,44,90,73,55,78

5. Measures of Spread Examples
For the following sets of data numbers:
List them from least to greatest.
Find the mean, standard deviation, and variance
,98,89,40,77,90,100,99,86,69,91 a.
b. Mean =
Standard Deviation=
Variance =
Range =
2 40, 74, 91, 98,72,85, 71,71,75, 46, 92,91, 55, 125
,77,70,97,86,94,47,66,38,72,80,53,81
4 80,33, 78,70,28,75,97,75,63,84,55,52

6. Ticket out the door 5-18 Measures of Spread
For the following sets of data numbers:
List them from least to greatest.
Find the mean, standard deviation, and variance
,97,85,65,100,92,84,84,89,68,80 a.
b. Mean =
Standard Deviation=
Variance =
Range =
2 88, 64, 73, 79, 74, 83, 92,92, 98, 56, 67, 82