Sampling Distributions With Means And Proportions Flashcards
What is P
Population proportion
What is a parameter
It is the population
What is a statistic
It’s a calculated sample
What happens if your sample size increases
The standard deviation decreases
What happens when sample size decreases
Standard deviation increase
To approx a normal curve you must show what for the mean
If it’s greater or equal to 30
To approx a normal for proportions you must show what
N(p)
N(1-p).
Greater or equal to 10
What is the mean standard deviation
Sd over square root of n
Standard deviation formula for proportions
Square root of p(1-p) over n
Mean of the sample mean equals the mean of the
Population
Mean of the sample proportion equals the
Population proportion
If the mean of a sampling distribution equals a statistic used to estimate that mean it is
Unbiased
To find probability greater than a number use
Normal cdf
Use inversnorm to
Find sample mean or proportion at certain percentile