Conditions
The conditions for a one-sample z test
What are...
-Random Sample
-10%<n of the total population
- Large counts: np>= 10, n(1-p)>=10
What is a linear regression t-test or interval?
Formula for conditional probibility.
What is P(A|B) = P(A and B) / P(B)?
The qualities of Simple Random Sampling.
What is: Every element in the population has an equal chance of being chosen, ie, choosing a name from a hat?
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Conditions for a one-sample t-test.
What are...
-Random Sampling
-10% of the total population w/o replacement
-Population is normal, large (n>=30), or not skewed
It is about proportions and has 1 sample.
What is a 1 proportion z-test or interval?
The test for event independence.
What is...
P(A/B)= P(A)
P(B/A)= P(B)
or
P(A and B)= P(A)*P(B)
The qualities of a systematic sampling.
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Conditions for the t-test or t-slope.
What is
Linear
Independent
Normal
Equal Variance
Random
It is about means and has 2 samples.
What is a 2 mean t-test or interval?
The calculation for P(A and B).
What is P(A and B)= P(A)* P(B/A)
The qualities of a Stratified Random Sampling.
What is: Using predetermined groupings based on the population's stratification, and sampling equally from all groups for equal sampling distribution.
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Conditions for a two-sample t-test and t-interval for mean1-mean2.
-Random: Data comes from 2 independent random samples
-10%: When sampling w/o replacement n<10% of total population for both samples
-Normal: Both populations are normal, sufficiently large, or are not skewed.
There is a table of frequencies, 1 sample, and 1 variable.
What is an X^2 GOF test?
What is, if P(A and B)=0?
The qualities of Cluster Sampling.
What is selecting pre-made groups instead of individuals for sampling?
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Lemur
The reason we check Randomness, 10% condition, and sample normality.
What is, because...
-Random: So we can generalize to the entire population from which the sample was selected
-10%: So sampling without replacement is okay, and we can use the standard deviation formula
- Normality: So the sample is normal.
χ² = Σ [(O - E)² / E]
What is the Test Statistic Formula Chi-Squared Test for Homogeneity/ Independence?
What is P(A)+P(B)- P(A and B)?
The bias found in a sample that was made by sampling every person who enters a video game store about their favorite video game.
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