![]() ![]() Cochran's Q statistic is a chi-square variate formed by a ratio of the variation in success across tasks to the variation in success within subjects. Based on the statistics and frequency tables, you would expect a large statistic because you observed quite a bit of variation in success by task.
Because a chi-square this large is unlikely to have arisen by chance, the design team rejects the null hypothesis that all tasks have an equal number of successes. Clearly, users had difficulty interacting with the support list, as well as the fax and newsletter request pages. |
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Cochran Test Table |