Test 2 Prep Flashcards
When should we use t test over z score?
When both pop SD and pop mean are unknown
t
M - π / π π
One-Sample Standard Error
square root of s^2/n
One-Sample Variance (s^2)
SS/df
One-sample and paired-sample df
n-1
Independent Samples df
n1 + n2 - 2
Independent Samples Sample Data
M1 - M2
As sample size decreases, a confidence interval gets
wider
As confidence decreases, a confidence interval gets
narrower
If you set alpha = 0.10, then you would calculate a
90% confidence internal
πΆπβππβ²π π
πβπ/π
List the four steps of the hypothesis testing procedure in the correct order
- State the hypotheses
- Set the criterion for a decision
- Get sample data and calculate statistics
- Make a decision
probability of obtaining a test
statistic, as extreme as or more extreme than our actual test statistic, by
chance alone, if the null hypothesis were true.
p value
the probability of detecting an effect if one
actually exists.
Power
a statistical decision error that involves
failing to reject a null hypothesis that is actually false.
Type II Error
Probability of making a Type II Error
Beta
A statistical decision error that is
analogous to a jury deciding that a defendant is guilty when in fact
the defendant is innocent.
Type I error
a measurement of the absolute magnitude
of an effect, regardless of sample size.
Effect Size
