Probability
What is P(A or B)
P(A) + P(B)
What is P when calculating the Confidence Interval
P is the probability of success in an event
Simple Random Sample
What do you do if the conditions for a test have not been met?
You dont perform the test
How do we write null hypothesis and alternative hypothesis?
Ho : (P-hat) =/</> x
Ha : (P-hat) =/</> x
What is P(A and B)
P(A) * P(B)
How do we calculate z star
1 - (1 - CI / 2)
What is a systematic sample
It is where you choose to sample every Kth person
What is the Central Limit Theorem
N >= 30
What is r when looking at the least square regression line?
r is the correlation coefficient and it tels you how well the x and y axis values correlate between 0 and 1.
What is P(A|B)
P(A) * P(B) / P(B)
What is the Confifence Interval equation?
CI = P +/- (z-star)(SE)
Why is it bad to perform convinience samples?
What is IRTS
I - Independent
R - Random
T - Ten percent rule
S - At leat ten percent successes and failures
Median is the middle of the data and mean int he average of the data numbers.
What does it mean to be mutually exclusive?
It means you can't be both events at the same time you can't be P(A) and P(B).
How do we interperet CI.
What are x% confident that the true population proportion of (Context) is between (y, z).
I go to a college and would like to know what percent of students are satistfied with the campus food. So I interview every 9th person, what type of sample is this?
Systematic sample
What is BINS
B - Binomial
I - Independent
N - Success and Failures
S - Same probability for every sample
If we increase the sample size on a SRS what will happen to the datas mean and standard deviation?
The mean will get closer to the true population proportion and the standard deviation will become smaller.
What is P(A or B) given that P(B) = .9 and P(A and B) = .72
.98
How do we calculate the CI when testing for the difference in to data sets.
CI = (P1 - P2) +/- (z-star)(sqrt((P1(1 - P1) / n1) + (P2(1 - P2) / n2)))
What is the difference between a Cluster Sample and a Stratified Random Sample?
Cluster samples are you randomly selecting which group to interview, Stratified Random Samples is where you have broken down your sample into strata and then perform and SRS on each strata.
What does RICE stand for?
R - Random
I - Independent
C - Counted Data
E - Expected Cells
How do we calculate SE calculating the difference between to data sets.
sqrt((P1(1 - P1) / n1) + (P2(1 - P2) / n2))