13.5 sampling techniques the power of collecting data!!!
TRANSCRIPT
13.5 Sampling
TechniquesThe power
of collecting data!!!
Suppose we have the following population……..
Random Each individual has the same chance of getting picked.Assign each a digit. Use a random number generator!
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
Stratified RandomOrganize into distinct groups.THEN randomize!
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
Systematic Creating a rule. Such as every 5th person gets picked.
Convenience SampleChoosing who you want!
Self-SelectedVolunteers!!
Pick Me! I volunteer!
Eh, why not?
Am I getting paid for
this?
Biased Questions
When surveys are given, some questions can prevent accurate data from being gathered, even WITH ACCURATE SAMPLING.
Take the following question for example:
“Do you prefer the powerful PS4 or the X-Box One?
Biased Questions
We can try to re-write the question in a way that does not give preference one way or another. This usually leads to us eliminating adjectives.
“Do you prefer the PS4 or X-Box One?”
Classwork: 13.4 pg.861-867 #2-34 even13.5 pg.871-874 #2-26 even
E.C. 13.4ps #1-5
HomeworkNotes 13.6-13.7
Due next class! Make sure you bring your past classwork to class each day! You never know when you’ll have a classwork quiz