Purchase Solution

Variable meaning

Not what you're looking for?

Ask Custom Question

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."

Purchase this Solution
Solution Summary

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

Solution Preview

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

Purchase this Solution
Free BrainMass Quizzes
Geometry - Real Life Application Problems

Understanding of how geometry applies to in real-world contexts

Graphs and Functions

This quiz helps you easily identify a function and test your understanding of ranges, domains , function inverses and transformations.

Exponential Expressions

In this quiz, you will have a chance to practice basic terminology of exponential expressions and how to evaluate them.

Probability Quiz

Some questions on probability

Know Your Linear Equations

Each question is a choice-summary multiple choice question that will present you with a linear equation and then make 4 statements about that equation. You must determine which of the 4 statements are true (if any) in regards to the equation.

View More Free Quizzes
Related BrainMass Solutions

  • Ordinal and interval level variables

    zero point Ordinal data is ranked (ordered), and the distances between attributes do not have any meaning Interval data the distance between attributes does have meaning, but there is no meaningful zero.

  • Multiple regression analysis for San Francisco demand

    Variable Economic Meaning Statistical Significance Price (P) Competitor Price (Px) Advertising (Ad) Income (I) The regression coefficients give the effect of unit change in the independent variable on the dependent variable (

  • Clarifying the Result for the Meaning of the Correlation

    What it suggests is when one variable increases, the other variable will decrease in terms of their values. The solution clarifies the result regarding the meaning of the correlation.

  • Closing the Digital Divide

    Variable A Impact of subsidy received Variable B Age of students at school Correlation Positive Meaning: The impact of subsidy received is higher (or more magnified) as the age of students increases.

  • The Meaning of Variable Cost

    68405 Accounting Managerial If the activity level increases, then one would expect the variable cost per unit to increase as well. True False False AS Variable cost per unit remain same This explain the meaning of Variable cost

  • independent variable or dependent variable?

    Independent variables are predictor variables, meaning they help explain the change in the outcome. They predict the outcome variable (dependent variable).

  • Predicting Sales at a Sporting Goods Store

    At the 0.05 level of significance, is there eveidence of a linear relationship between the independent variable and the dependent variable? G.) Construct a 95% confidence interval estimate of the population slope and interpret its meaning.

  • Simple and Multiple Linear Regression

    Interpret the meaning of the estimated slope parameters (b, c and d) and discuss whether the estimation results match your a priori expectations of the relationships between the dependent variable and each explanatory variable.

  • Exercise 20.1: Accounting Meaning

    Semi Variable Costs h. Operating income less variable costs. None This solution associates accounting terms with their meaning. It is 181 words in total length and needs no reference.

  • Regression Analysis: Implementation and Interpretation

    Use the estimated equation to calculate a new predicted value of the dependent variable, i.e. make a forecast. 6. Explain the meaning of R square. 7. Explain the meaning of the F test of significance.

View More Related Solutions