Jeff Sauro, James R Lewis, "Quantifying the User Experience: Practical Statistics with respect to User Research"
2012 | ISBN-10: 0123849683 | PDF | 312 pages | 5,2 MB
You're root asked to quantify usability improvements through statistics. But even with a background in statistics, you are hesitant to statistically decompose the data, as you may be unsure about which statistical tests to practice and have trouble defending the practice of the small test sample sizes associated by usability studies.
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