Flashcards in Normal distribution and estimation statistics Deck (10)
If the distribution is skewed, would you use mean, median or mode?
Why do we want our data to be normally distributed?
Most statistical tests require it
It allows us to make predictions about data/make assumptions beyond sample data
What is needed to calculate the normal distribution?
Mean and standard deviation
How many SD is 95% probability? 99%?
How can you assess normality?
Kurtosis/skewness within 1
How do you calculate z-score?
(observed value - total mean) / standard deviation of sample
What is the z-score of 95% confidence? 99%?
How do you calculate standard error?
How do you calculate margin of error?
z-score x SE
e.g. 1.96 x SE