Week 4 - Distributions

Question 1

the normal distribution

Answer 1

it is bell shaped, symmetric and has two parameters: the mean and the standard distribution

Question 2

z-scores

Answer 2

measures the number of standard deviations something is away from the mean

z = x - mean / SD

Question 3

68%, 95%, 99.7% rule

Answer 3

in a normal distribution:
68% of observations are in 1 SD
95% are within 2 SD
99.7% are within 3 SD

Question 4

standard normal probability table

Answer 4

this table tells us the probabilities associated with different z scores

Question 5

Bernoulli random variable

Answer 5

when an individual trial only has 2 possible outcomes

Question 6

geometric distribution

Answer 6

a type of discrete probability distribution that represents the probability of the number of successive failures before a success is obtained in a Bernoulli trial.

Question 7

Binomial Distribution

Answer 7

binomial probability = no of scenarios x p(single scenario)