Random stats Flashcards
Discrete data lower quartile
n/4, if a decimal round up, if whole halfway between that and the next one
Discrete data upper quartile
3n/4, if a decimal round up, if whole halfway between that and the next one
How to compare data
Measure of location, measure of spread, median and IQR more suitable if outliers, mean and sd other option
Bivariate data
Pairs of values for 2 variables
Regression line in form y=mx+c
y on x
Binomial distribution conditions
Fixed number of trials n, 2 possible outcomes, fixed probability of success, trials independent
If a random variable has the binomial distribution B(n,p) then its probability mass function is given by
P(X=r) = nCr p^r (1-p)^n-r
PMF - a function over the sample space of a discrete random variable X which gives the probability that X is equal to a certain value
n - index
p - parameter
Critical region
Region which if the test statistic falls within the null hypothesis can be rejected
Critical value
First value to fall within the critical region
Test statistic
Statistic calculated from the sample
Product moment correlation coefficient
Describes linear correlation between 2 values
P(B/A) =
P(BandA)/P(A)
If independent P(B/A’) = P(B)
Complement of A
A’
How much in one sd
68%
How much in two sds
95%
How much in five sds
100%
