13.5 Sampling Techniques The 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!

Stratified Random Organize into distinct groups. THEN randomize!

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

Convenience Sample Choosing who you want!

Self-Selected Volunteers!! 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 #2-34 even 13.5 pg #2-26 even E.C. 13.4ps #1-5 Homework Notes Due next class! Make sure you bring your past classwork to class each day! You never know when you’ll have a classwork quiz