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

Tags

Tag: Standard Deviation

Related Tags

Tag Name #
Z-Score 477
mean 280
Quality Level 245
Standard Score 223
Probability 197
Process Sigma 193
Variance 165
87 156
T score 149
Calculator 149
Statistics 144
percentile to z-score calculator 139
Percentile 138
Normal Curve 129
pareto 117
Raw Score from Z-score 109
Critical Value 107
25 102
1.5 99
t-score 99
85 99
1.78 98
Standard Error of the Mean 94
z area 94
test statistic 92
theo 91
Alpha 90
Math 90
Median 89
Stanine 88
2-sample t-test 84
frequency distribution 83
-2,13 83
90 83
invNorn 81
2.13 80
normal model 79
cut off score 76
xbar 74
midquartile 74
significance 73
Unequal Sample Size 73
-.03 69
Zc 52
alpha z 48
-1.92 47
factor analysis 46
example 1
bmi 1
Publications 1
1
x score 1
skewness 1

Pages

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

Z-Score to Percentile Calculator ( 159 )
Look up the area under the normal curve (1 or two-sided areas) from a standard score (Z-score).

How Do You Calculate a Z-Score/ Sigma Level? ( 101 )
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 Standard Deviation associated with them. The number of users that have also tagged the question ' Standard Deviation ' is in parenthesis.

A sample of 36 observations is selected from a normal population. The sample mean is 21, and the sam. . . ( 2 )

When estimating the mean of a population, how large must the sample be in order that the 95% error m. . . ( 4 )

A telephone manufacturer wants its telescope to have standard deviation in resolution to be signific. . . ( 4 )

A telescope manufacturer wants its telescopes to have standard deviations in resolution to be signif. . . ( 5 )

Based on information obtained from a sample of 54, a 98% confidence interval for the average profit . . . ( 3 )

A sample of households that subscribe to the United Bell Phone Company revealed the following number. . . ( 4 )

Explain the difference between testing a single mean and testing the difference between two means. W. . . ( 5 )

The random variable x has the following probability distribution. x 1 2 3 4 5 . . . ( 5 )

Want a sample size of about 60 (30 controls and 30 cases). At 5% significance and 80% power.How do i. . . ( 6 )

An engineer in an automotive factory wishes to know what the tire pressure is on all cars leaving th. . . ( 4 )

a score that is 8 points above the mean corresponds to a z-score=0.05 What is the population standa. . . ( 5 )

Annual starting salaries for college graduates with degrees in business administration are generally. . . ( 5 )

Annual starting salaries for college graduates with degrees in business administration are generally. . . ( 4 )

What is the difference between a population standard deviation and a sample standard deviation?. . . ( 4 )

I know that 33 is the raw score of the 85th percentile. How do I determine the mean?. . . ( 4 )

When calculating confidence interval estimates...how is the x and standard deviation calculated?. . . ( 5 )

difference between a sample parameter ( X-bar and s ) and a proportion parameter ( p )? . . . ( 4 )

How do you calculate the z score for the raw score of 10 based on the following distribution: 8, 9,. . . ( 10 )

How do you calculate standard deviation?. . . ( 4 )

What percent of the time should this occur? (Z-Score) ?. . . ( 5 )

How do you determine the sample size for data for which the mean and standard deviation are not know. . . ( 8 )