Exam 2 Review Flashcards
How do you calculate if something is out of control?
u+- 3 sigma/
Square root of n.
Central limit theorem
When sampling from a non-Normal population, the sampling distribution of x is
approximately Normal whenever the sample is large and random.
Formula for correlation is ___ are x and y interchangeable?
r= 1/n-1 x E(xi-xbar/Sx(s.d.)*(yi-ybar/Sy(s.d)) yes
Law of large numbers
The fact that the average ( x ) of observed values in a sample will get closer and closer
to μ as the sample size increases.
b=
r*(Sy/Sx)
mean of the sampling distribution of x
the mean of all the sample means ( x =s) from all possible samples of
size n from a population; equals μ.
no association
A condition where values of one variable occur independent of values of another variable;
detected when the conditionals of a two-way table equal the marginal distribution (and each other.)
parameter symbols: μ, σ, and p
mean of population, standard deviation of population, proportion of a
population, respectively
For regression analysis, you have to have # _______of _______
2 variables of quantitative value
r2:
The percentage of total variation in the response variable, Y, that is explained by the regression equation; in
other words, the percentage of total variation in the response variable, Y, that is explained by the
explanatory variable, X.
statistic symbols: x , s, p
mean of sample, standard deviation of sample, proportion of sample, respectively
unexplained variation:
The sum of squared residuals
The formula for Standard deviation of sampling distribution of x is
sigma/ square root of n.
with correlation, x and y are interchangable
Yes
do correlation variables have to be quantitative, or regression variables?
both
