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13 Cards in this Set

  • Front
  • Back
What are the six cause categories in a fishbone chart?
Measurement, Materials, People, Environment, Methods, Machines
What does OFAT stand for?
One factor at a time
What are the basic guidelines in designing an experiment?
Problem statement, response variable, factors and levels, experimental design, perform the experiment, conclusions
How are potential and other design factors grouped?
Potential design factors, noise/nuisance factors, uncontrollable factors, held-constant factors.
What is a fishbone chart?
A method for matching causes with an effect (response variable)
What is a pareto chart?
It sorts values greatest to smallest to show dominate classifications of the data. The power law or 80/20 rule.
What is a probability plot used for?
Its a quick way to identify normality of data.
What do we mean by univariate and bivariate data?
Univariate data is uncorrelated, i.e. 1,2,3,4,5
Bivariate is pairs of values (x,y)
What is the central limit theorem?
Sum of a large number of samples will tend toward normal distribution.
In data regression what is meant by residual values?
Residual values is the amount of error between each data point and the curve fit against it.
What is the p-value used for?
It is the chance of wrongly rejected the null hypothesis.
When should you reject the null hypothesis?
When the p-value is less than or equal to the significance level (alpha). For a 95% confidence interval, alpha is .05.
How do you use the p-value to determine whether your probability plot is showing normal data?
P-value is greater than your significance level. For 95% CI, greater than .05.