The article “Can You Test Me Now? Equivalence of GMA Tests on Mobile and Non-Mobile Devices” (Int. J. Select Assess. 2017: 61–71) describes a study in which 1769 people were recruited through Amazon Mechanical Turk to take a general mental ability test. (Researchers used the WPT-R test, a variation on the Wonderlic Personnel Test used by the NFL to evaluate players.) Participants were randomly assigned to take the test on one of three electronic devices; the data is summarized below.

The goal of the study was to determine whether the three devices can be considered “equivalent” for the purpose of administering mental ability tests. Perform an ANOVA at the .05 significance level, and explain what you discover.

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Device Computer Tablet Smartphone n 724 476 569 Mean score 33.98 34.40 34.26 SD 7.65 7.75 7.59