A psychologist investigates whether the description on a cup affects how adults rate a fruit drink. The drink is identical in every cup.
| Plan | Participant allocation and procedure |
|---|---|
| A | 20 adults taste a cup described as a 'new recipe'. A different 20 adults taste a cup described as an 'original recipe'. Each adult gives one rating from 1 to 10. |
| B | The same 20 adults taste one cup with each description. Each adult gives two ratings from 1 to 10. |
Both plans produce 40 ratings.
State which plan uses an independent measures design.
Give one disadvantage of using Plan A rather than Plan B.
Explain why demand characteristics may be less likely in Plan A than in Plan B.
182 exam-style questions on OCR GCSE Psychology 7.1 Planning Research, covering 7.1.1 Hypotheses, 7.1.2 Variables, 7.1.3 Experimental Designs, 7.1.4 Populations and Sampling, 7.1.5 Ethical issues, and 7.1.6 Dealing with ethical issues and BPS Code. Each one has a worked solution and a mark scheme showing where the marks go.