1. Tasks 1. 1. Complete the two pages on Sampling techniques in your booklets 2. 2. Complete the page on controlling Extraneous variables and bias in your booklet 3. 3. Complete the Review of extraneous variables page

2. Task 1 ► ► Using your textbook, complete the table in your booklet on the description and evaluation of 3 types of sampling

3. Sampling DescriptionAdvantagesDisadvantages Random Opportunity Volunteer

4. Application of sampling techniques ► ► Answer the 4 questions in detail.

5. Extraneous variables and bias ► ► Match the title at the bottom of the page to the problem in the table. ► ► Then, use the next slide to find 2 solutions for each problem: the solutions on the next slide are in random order and you must think carefully to match them correctly. ► ► EACH PROBLEM HAS 2 METHODS OF CONTROL

6. Extraneous variables and bias: match the method of control to the problem Use double blind technique Counterbalance conditions (ABBA) Reassess definition of IV Use a matched pairs design Check external reliability (e.g. inter-observer) Use a non- laboratory environment Use independent measures Sample large and randomly Use deception to hide research aim (single blind) Use independent measures Use standardised instructions Carry out pilot study

7. Task 3 ► Complete the page on review of EVs

8. Homework ► ► Revision notes on today’s lesson content (EVs and sampling)