The Binomial Distribution

Question 1

What are the two parameters of the binomial distribution?

Answer 1

Sample size (n) and the probability of the outcome of any one individual (pi)

Question 2

What is the definition of right skewed data?

Answer 2

Data are right-skewed if the mean for the data is larger than the median. This is caused by the right tail being heavier than the left.

Question 3

What is the definition of left skewed data

Answer 3

Data are left-skewed if the mean for the data is smaller than the median. This is caused by the left tail being heavier than the right tail.

Question 4

When is it acceptable to use the normal approximation to the binomial distribution?

Answer 4

When npi and n-npi are 10 or more. i.e. there are 10 or more individuals with the outcome and 10 or more without the outcome.