Open vs Closed
How often do you charge your phone per week?
A: 1-2
B: 3-5
C:6-8
D: 8+
Closed
For the following examples, determine whether the survey sample is biased or unbiased. Explain your answers.
Question: What is your favorite soft drink? The sample is chosen by picking names, randomly, out of a telephone book.
Unbiased
When the sample is selected at random. All samples have an equal chance of being selected.
Simple Random Sample
Most Popular brand of Chips
Lays
Would you like to go to the movies tonight
Yes/No
Closed
For the following examples, determine whether the survey sample is biased or unbiased. Explain your answers.
Question: What is your favorite sport? A sample is chosen from people attending a soccer game.
biased – you should expect the most popular sport to be soccer because these people were attending a soccer game.
Mr. Millard wants to know how many students feel they “Work Hard and Respect Others.” He sends a survey to every 5th student on his enrollment list.
Systemic Sample
Most Ordered McDonalds Item
Fries
Walk me through your typical day.
Open
For the following examples, determine whether the survey sample is biased or unbiased. Explain your answers.
Question: Should more money be put into athletic programs or music programs at school? Sample is chosen from students in the band program
biased – results will overestimate the proportion of people who would support music programs
An Algebra 2 teacher wants to know how many students are projected to enroll in AP Statistics next year. He randomly picks two of his entry-level classes and asks every student in each class what their plans are.
Cluster Sample
Most used spice in the world
Black Pepper
How did you feel about using the website to do this task?
Open
For the following examples, determine whether the survey sample is biased or unbiased. Explain your answers.
Question: What is your favorite vacation destination? Sample is chosen by asking every student in the class.
Unbiased: Cluster Sample
This sampling technique divides the sample space into groups, then selects a random sample from each group.
Stratified random sampling.
Nickname of Babe Ruth
The Great Bambino
Create your own example of both.
Teacher Choice
DECIDE IF THIS IS BIASED, IF SO, REWRITE: Don’t you agree that the voting age should be lowered to 16 because many 16-year-olds are responsible and informed?
YES
CHOOSE THE BEST METHOD: Car detailer Ellie wants to know the average time it takes to detail a car at her car wash on a given day. She does not know the total number of cars that will come to the car wash that day. She does not have a list of all the cars that will come to the car wash that day.
Systematic sampling
Name at least 3 of Kanye's and Kims Kids
North, Saint, Chicago, Psalm