AP Stats Review

What is the Outlier formula?

Q1 - 1.5(IQR)

Q3 + 1.5(IQR)

Simple random sample example

random # generator

When to use stratified random sample:

When you expect a difference between each group

Cluster sample example

taking random samples from different schools to come to a conclusion about a school district

systemic sample example

you pick the 5th individual who walks in

convenience sample

you do a sample that is most convenient for the researchers

voluntary response

asking for volunteers instead of selecting participants

non-response

researchers choose participants, but they may choose not to participate

response bias

when the way that the question is presented could cause bias (the way a question is worded)

undercoverage bias

when part of a population could not be covered (landline phones for survey)

single-blind experiment

when either the subject or reader is blind

double-blind experiment

when subject and experimenters are blind

how to reduce variability

• Randomly assign subjects to more than one group

• Control the factors

• Large enough amount of subjects'

• Replication of the experiment

disjoint

what does or mean?

or—>add

What defines a geometric distribution?

non-fixed number of trials

what defines a binomial distribution?

fixed number of trials