Priority formulas Flashcards
(18 cards)
How to calculate population mean/ Expected value
Sum of Xp(X)
Formula for variance of a population
E(x^2) - E(x)^2
What is the mean of a sample distribution of sample mean bar
E(x) = mu
What is the variance of a sample distribution of sample mean bar
V(X)= sigma squared/n
Confidence interval formula
Xbar - Mu/ Sigma/rootn
What table to use for confidence intervals critical values
Table 2
If you dont know sigma what do you use as a formula
Xbar-mu/s/root n
What distribution is used if we don’t know Sigma
T distribution with n-1 degrees of freedom
How to form confidence intervals for population proportion
P+1.96 root of Pi(1-Pi)/n
Hypothesis testing test statistic equation
Xbar- mu/s/rootn
For two tailed tests when do you reject
If |TS| > 1.96
What is a type 1 error
when you reject H0 when it is true
What is a type 2 error
When you accept H0 when its false
What is test statistic equation if we don’t know population variation and n is not >200
We use Xbar-Mu/s/rootn
If the |TS|>Cv then what is p in relation to A
p<a
What is the test statistic if we are testing a difference in population means and they have the same variance
What about test statistic if you don’t know sigma for difference in populations hypothesis testing
How to estimate s^2 for differences in population
