Statistics

Question 1

what is a mutually exclusive event and formula for this

Answer 1

when 2 events cannot happen together
P(A or B) = P(A) + P(B)
or also known as P(A U B)

Question 2

what is an independent event and formula for this

Answer 2

2 events do not affect the outcome of each other
P(A and B) = P(A) x P(B)
or also known as P(A ∩ B)

Question 3

what are the 4 conditions for a binomial distribution to be met

Answer 3

1. fixed number of trials
2. each outcome is classified as either a success or failure
3. trials are independent of each other
4. probability of success is the same in each trial

Question 4

sample random sampling

Answer 4

procedure when every passive sample of given a given size has an equal chance of being selected

Question 5

opportunity sampling

Answer 5

choosing respondents based upon their convenience and availability

Question 6

systematic sampling

Answer 6

taking participants at regular intervals from a list of the population with the starting point chosen at random

Question 7

stratified sampling

Answer 7

splitting the population into groups based o factors relevant to the research and then random sampling from each group in the proportion to the size of that group

Question 8

quota sampling

Answer 8

splitting the population into groups based on factors relevant to eh research and then opportunity sampling from each group until a required number of participants are found

Question 9

cluster sampling

Answer 9

splitting the population into clusters based on convenience and then randomly choosing some clusters to study further