Midterm Flashcards
If a process is operating with only chance causes of variation, what does that mean?
It is in statistical control
What are “chance causes of variation”?
Unavoidable causes that result in natural inherent variability
Also known as noise
What is type 1 error?
When Ho is true but you reject Ho
What is type 2 error?
When Ha is true and you fail to reject Ho
What is the relationship between the sample size and confidence interval length?
If sample size is x times larger, the confidence interval will be sqrt(x) times smaller.
New confidence interval length = old confidence interval length/sqrt(x)
What is common population variance?
MSE
What does increasing the sample size do to power?
Increasing the sample size increases the power
What does increasing the alpha value do to the power?
Increasing alpha increases the power
What is the estimate of common population mean?
X bar bar,
(Xbar1s1 + … + xbar2s2)/N
How to get sp^2 without calculating it?
sp^2 = MSE
What is the estimate of common population standard deviation?
Sp = sqrt(MSE)
What is the denominator of the ANOVA test statistic?
MSE
What is the numerator of the ANOVA test statistic?
MSG
What does MSE measure?
variation within individual samples
What does MSG measure?
variation between sample means
