Intuitivet tests: Lay use of statistical information
 Natalie A. Obrecht,
 Gretchen B. Chapman,
 Rochel Gelman
 … show all 3 hide
Abstract
Normatively, a statistical pairwise comparison is a function of the mean, standard deviation (SD), and sample size of the data. In our experiment, 203 undergraduates compared product pairs and judged their confidence that one product was better than the other. We experimentally manipulated (within subjects) the average product ratings, the number of raters (sample size), and theSD of the ratings. Each factor had two levels selected, so that the same change in statistical power resulted from moving from the low to the high level. We also manipulated (between subjects) whether subjects were given only the product rating data as summarized in a statistical format or the summaries plus the raw ratings. Subjects gave the most weight to mean product ratings, less weight to sample size, and very little weight toSD. Providing subjects with raw data did not increase their use of sample size andSD, as predicted.
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 Title
 Intuitivet tests: Lay use of statistical information
 Journal

Psychonomic Bulletin & Review
Volume 14, Issue 6 , pp 11471152
 Cover Date
 20071201
 DOI
 10.3758/BF03193104
 Print ISSN
 10699384
 Online ISSN
 15315320
 Publisher
 SpringerVerlag
 Additional Links
 Topics
 Industry Sectors
 Authors

 Natalie A. Obrecht ^{(1)}
 Gretchen B. Chapman ^{(1)}
 Rochel Gelman ^{(1)}
 Author Affiliations

 1. Psychology Department, Rutgers University, 152 Frelinghuysen Road, 088548020, Piscataway, NJ