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Showing 49–55 of 55 results

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  Problem Frequency Calculator

  $17.73 – $25.99 Select options
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  Average Task Time Calculator

  $11.56 – $49.99 Select options
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  A Practical Guide to Measuring Usability

  $39.60 – $89.99 Select options
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  zScore Calculator

  $19.99 – $29.99 Select options
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  Confidence Interval Comparison Calculator

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  Usability Statistics Package Expanded

  $399.99 – $798.99 Select options
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  Usability Statistics Package

  $199.99 – $398.99 Select options