July 2016
Beginner
350 pages
13h 46m
English
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Chapter 4
Did we meet or exceed our goal?
Abstract
This chapter covers methods for determining whether a design has met or exceeded a specific goal. The statistical test you use for completion rates depends on the sample size: A sample size is considered small unless you have more than 15 successes and 15 failures. For determining whether a certain percentage of users can complete a task for small sample sizes use the midprobability from the binomial distribution. For determining whether a certain percentage of users can complete a task for large sample sizes use the normal approximation to the binomial. You can always convert continuous rating scale data into discrete-binary data and test a percentage that agrees with a statement, but in so doing, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.