Units 1-2
Type of variable where you cannot find the average of values is this
What is a categorical variable?
The difference between an observational study and an experiment is this
What is an experiment has treatments imposed?
The complement of "event A" can be described as this
What is the event of A not happening?
The correct test for estimating a population proportion for a group of 500 people is this
What is a one-sample z interval for p?
The degrees of freedom for a linear regression t test for beta is this
What is n-2?
Values included in the five-number summary are these
What are min, Q1, med, Q3, max?
An outside variable that influences both the explanatory and response variables is known as this
What is a confounding variable?
The probability of mutually exclusive events A and B happening together is this
What is 0?
The correct conclusion for finding a p-value above the alpha is this
What is fail to reject Ho?
The correct chi square test when you have two samples and one variable is this
Chi square test for homogeneity
Horizontal outliers are known as these type of points
What are high leverage points?
The type of bias that results when an individual is part of a sample but chooses not to respond is known as this
What is nonresponse bias?
The conditions needed to prove a distribution is binomial are these
What is binary outcome, independent, set number of trials, and same probability?
As the confidence level increases, the width of the interval does this
What is increases/gets wider?
The skew of a chi square distribution does this as degrees of freedom increase
What is skew decreases?
A vertical outlier impacts the line in this way
What is shifts the line up/down?
The difference between groups created by a cluster random sample and a stratified random sample is this
What is cluster creates heterogeneous groups and stratified creates homogeneous groups?
The two things needed for a probability model to be considered valid are these
What is all probabilities add to 1 and each probability is between 0 and 1
The correct test for finding convincing evidence of a population mean difference is this
What is a one-sample matched pairs t test for mud?
The conditions for inference for a linear regression t test for beta are these
What are linear, independent, approx. normal, and equal SD?
An interpretation of r squared is this
What is r squared percent of the variation in the response variable can be explained by its relationship with the explanatory variable?
The correct conclusion when a study has random assignment but does not have random sampling is this
What is the treatment causes changes in the response variable for people similar to those in the study?
The formula for standard deviation when subtracting two discrete random variables is this
What is sqrt (sdx2 + sdy2)?
The probability of power is this
What is P(Power) = 1-P(Type II Error)?
The transformation to x and y for an exponential function is this
What is x vs. log(y) or ln(y)?