Sampling
If these were the answers to a survey, what might the question have been? 2, 10, 7, 5, 3, 8, 10
...
It is perfectly okay if you collect data that is biased. True or False.
False.
What is a? 40 = a x 5
8
What invention lets you look right through a wall?
A window
A teacher puts everyones name on a piece of paper and puts it in a bag. She chooses who will answer one of her questions by picking a paper with a name from the bag. What type of sampling is this?
Simple Random Sampling
Toys R Us wants to know where their shoppers are traveling from. They only ask customers who spend more than $14. Is this an example of sampling bias? Why or why not?
Yes, this is an example of sampling bias as customers who spent less than $14 are not being represented.
How may faces does a rectangular prism have?
6
What is always in front of you but can’t be seen?
The future
Holly wants to know what subjects the teachers at her school enjoy teaching the most. She surveys 4 teachers from each division. What type of sampling is this?
Stratified Random Samping
Holly wants to know what subjects the teachers at her school enjoy teaching the most. She surveys 4 teachers from each division. Is this an example of sampling bias? How do you know?
No, it is not an example of sampling bias. She asked 4 teachers in each division which means each division would be represented equally.
What is 3 to the power of 3?
27
There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What color are the stairs?
There are no stairs
Toys R Us wants to know where their shoppers are traveling from. They ask every 7th person to provide their postal code at checkout. What type of sampling is this?
Systematic Random Sampling
What type of bias is this? : A firefighter asks people on the street if they have ever considered starting a forest fire.
Measurement Bias
Solve this problem: 100 - 50 x 3 + 6
-44
Mary has four daughters, and each of her daughters has a brother. How many children does Mary have?
5