1. 13.5 Sampling Techniques The power of collecting data!!!

2. Suppose we have the following population……..

3. 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

4. Stratified Random Organize into distinct groups. THEN randomize! 1 2 3 4 5

5. Systematic Creating a rule. Such as every 5 th person gets picked.

6. Convenience Sample Choosing who you want!

7. Self-Selected Volunteers!! Pick Me! I volunteer! Eh, why not? Am I getting paid for this?

8. 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?

9. 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?”

10. Classwork: 13.4 pg.861-867 #2-34 even 13.5 pg.871-874 #2-26 even E.C. 13.4ps #1-5 Homework Notes 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