I want help understanding the following statement. I need to be able to use this formula but I don't quite get it. What does the little n stand for? So suppose my universe is 15 usability problems and each subject gets 20% of them (the L) how do you use the little N in this equation to get the result? Here is the paragraph that I want to understand:
"Tom Landauer and I showed that the number of usability problems found in a usability test with n users is:

N(1-(1-L)n)

where N is the total number of usability problems in the design and L is the proportion of usability problems discovered while testing a single user. The typical value of L is 31%, averaged across a large number of projects we studied."

Solution Preview

little n stands for number of users.
In your case, if it's ...

Solution Summary

This gives one example of interpreting a variable in an equation.

... 9. Which variable was least affected by the empowerment program ... for the researchers to include the total means and SDs for the study variables in Table ...

... viewpoint, meaningful correlation simply means that there ... of a straight-line relationship between 2 variables. ... evidence is clear that variable A (psychological ...

... Classroom size Multiple Comparisons Dependent Variable: Math_Score Scheffe 95 ... The error term is Mean Square(Error ... ANCOVA output table (for variables related to ...

... (see 2.2 - 2.5 in the textbook). Table 1 Descriptive statistics of the variables Variable Frequency % Mean Std Dev. Major Business 253 47.1 Nonbusiness 284 52.9 ...

... For each of the variables described below, indicate ... is a quantitative or a categorical (qualitative) variable. ... 99% confidence interval for the true mean of all ...

... 25 another random Both ratings travel guide mean score for ... 2 = 45.04% is > 5% (significane level) Variable 2 is ...Variables 1 and 3 have non zero coefficients 95 ...

... numbers. b) Consider a sample size of 2 without replacement. Find the mean of the variable x. 6 ... replacement. Find the mean of the variable x. 6 ...