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Measuring Usability Homepage
Quantitative Usability, Statistics & Six Sigma by Jeff Sauro

Tags

Tag: Variance

Related Tags

Tag Name #
Z-Score 260
Quality Level 214
Process Sigma 179
mean 170
Critical Value 92
Standard Deviation 87
87 85
85 81
Standard Score 81
Standard Error of the Mean 78
Probability 77
Math 77
theo 74
frequency distribution 73
pareto 73
t-score 69
90 66
normal model 64
test statistic 60
cut off score 48
factor analysis 18

Pages

The following pages have the tag Variance associated with them. The number of users that have also tagged the page ' Variance ' is in parenthesis.

How Do You Calculate a Z-Score/ Sigma Level? ( 149 )
The basics of z-scores are discussed plus an example of raw usability data converted into z-scores including three of Nielsen's five usability attributes.

Questions

The following questions have the tag Variance associated with them. The number of users that have also tagged the question ' Variance ' is in parenthesis.

A telescope manufacturer wants its telescopes to have standard deviations in resolution to be signif. . . ( 4 )