z-score formula
Mean of sampling distribution for proportions
p is coming from the claim
standard devation of sampling distribution for proportions
What conditions do you check to see if you can use a normal distribution for a sampling distribution for proportions?
- Is each event independent of each other?
- Is the sample size less than 10% of the population size?
- Is the sample size large enough where np>=10 and n(1-p)>=10?
Mean for differences in sampling distributions for proportions
standard deviation in differences of sampling distributions for proportions
Mean of sampling distribution for means
standard deviation of sampling distribution for means
What conditions do you check to see if you can use a normal distribution for a sampling distribution for means?
- Tells you that data is approximately normally distributed or graph the data to see if it’s approximately normal (symmetric and unimodal)
- n>=30
Central Limit Theorem
when a sample size is sufficiently large, a sampling distribution of the mean of a random variable will be approximately normal.
Mean for differences in sampling distributions for means
Standard deviation for differences in sampling distributions for means
Finding the critical z value for each confidence level
