Lecture 6.Experimental Design

Each condition how many participants will we need to

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Unformatted text preview: ecruit if we plan to use an independent groups design? a)  b)  c)  d)  10 20 30 60 Assume we are conducting a study with 3 conditions (no music, pop music, classical music) and we want 10 people in each condition. How many participants will we need to recruit if we plan to use a repeated measures design? a)  b)  c)  d)  10 20 30 60 Assume we are conducting a study with 3 conditions (no music, pop music, classical music) and we want 10 people in each condition. How many participants will we need to recruit if we plan to use a matched pairs design? a)  b)  c)  d)  10 20 30 60 3 5/20/13   Dr. de Sade is planning to conduct a study to examine the influence of self esteem on pain tolerance. He plans to manipulate self esteem by giving false feedback (positive, negative) on an essay and he plans to measure pain tolerance by number of seconds participants will leave their arm in an ice bath. Which type of design do you recommend he uses? a)  Independent Groups Design b)  Repeated Measures Design   Disadvantages ◦  More participants (larger N) are required ◦  Random assignment does not always work to produce equivalent groups (especially when sample size is small) ◦  Even if groups are equivalent to begin with different rates of mortality may render them non-equivalent Pretest (DV) IV Measure Group/ Condition 1 Posttest (DV) Measure Participants Measure Group/ Condition 2 Measure 4 5/20/13   Advantages – Ensures groups are equivalent ◦  Helps us to ensure that the process of random assignment worked to produce equivalent groups (can be beneficial when sample is small) ◦  Helps us to ensure mortality is not a confound   Disadvantages – Pretest may have an effect on participants   Demand characteristic   Solutions: disguise pretest or use Solomon Four-Group De...
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This note was uploaded on 01/23/2014 for the course PSYC 217 taught by Professor Victoria during the Winter '11 term at The University of British Columbia.

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