Sample Size Calculator for Discovering Problems in a User Interface

Posted Comments

There are 5 Comments

February 2, 2012 | Ivan wrote:

Jeff,
the "Estimate Problem Occurrence (p) then Sample Size" calculator doesn't work now.
Uncaught TypeError: Object [object Object] has no method 'prettyGallery' 

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June 17, 2009 | Davant G Bryant wrote:

6. Why is population shape of concern when estimating a mean? What does sample size have to do
with it? 

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April 30, 2008 | Raul R Wells wrote:

Very useful, I could not move the bar, so it reported 50% against a 100% I wished to mark 

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January 4, 2008 | John Romadka wrote:

It might help if you could give a real world example of how these calculators could be used. Because I think I get it, but an example would make it more concrete. 

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January 4, 2008 | John Romadka wrote:

Jeff,
I wonder if you could add a little contextual help for the Problem Occurance field (".30"). Specifically, when would I use a number closer to 0 or a number closer to 1. 

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