Units 1+2
What are the conditions needed to describe distribution?
Shape, Strength, Outliers, Center
What sampling method gives each individual an equal chance of selection?
Simple Random Sample
What is the equation for P(BuA)?
P(B)+P(A)-P(BnA)
If the sample size (n) is sufficiently large and independent to each other, what theorem should you use to say the distribution is approximately normal?
Central Limit Theorem(CLT)
Inference for linear regression (Unit 9) focuses on estimating or testing this specific population parameter, usually symbolized by 𝜷 (beta)?
True slope of population regression line.
How do you find IQR?
Q3-Q1
What are the three main types of bias?
Volunteer, Under coverage, Non-Response
What is the difference between Mutual exclusive and Independence?
Mutual exclusivity is that the two things can't happen at the same time and Independent is that they don’t affect each other.
How do you calculate large numbers to prove normality?
np and n(1-p)
What is the critical value ($z^*$) used when constructing a standard 95% confidence interval for a proportion?
1.96
What is the formula for the Z-score?
(Statistic-mean)/SD
What is the main difference between an Observational Study and an Experiment?
Observational study is when you don’t randomly assign but an experiment is where you do randomly assign.
What is the difference between Binomial and Geometric?
Binomial has a set number of trials while geometric is many trials till success.
How do you calculate standard error for proportions?
√(p(1−p))/n)
What is the formula used to calculate the expected count for a specific cell in a Chi-Square test for Independence or Homogeneity?
(Row total x Column total)/Table total
If the correlation is strong, what number is the r2-value closest too?
1
What is the difference between Single and Double Blind?
Single only one knows what is being used where while double is where neither know what is being used where.
Suppose a basketball player is a 80% free throw shooter. If they take 5 free throws, what is the probability they make exactly 4.
0.4096
What two conditions must be met for independence?
Random and 10%
As the degrees of freedom increase and approach infinity, the shape of the t-distribution changes to look exactly like what?
Normal Distribution
What would you use to predict a value on a graph?
LSRL
What is the difference between the Statistic and the Parameter of an experiment?
Statistics are connected to the sample while the Parameter is connected to the population.
If the probability of having a sub in your next class is 0.27, and the probability that the sub is a male is 0.45, what is the probability that you have a sub in the next class that is a male?
0.1215
As the sample size (n) increases, what happens to the sampling distribution?
It becomes more Normal.
How do you check if a two sample z-test has large counts?
n1p1,n1(1-p1),n2p2,n2(1-p2)