STAT 200 Lesson 1 Notes: Gathering Data

3 Pages
Unlock Document

Astronomy and Astrophysics
Mengzhao Gao

STAT 200 Elementary Statistics Lesson 1 Gathering Data  Experiments deliberately impose treatment. This treatment is called a “factor.” There are multiple levels of factors.  Cluster random sample steps: 1. Divide population into a large number of clusters 2. Select a simple random sample of the clusters 3. Use subjects in those clusters as the sample  Stratified random sample steps: 1. Divide population into separate groups, called strata 2. Select a simple random sample from each strata 3. Combine the samples from all strata to form complete sample  Types of observational studies: 1. Sample survey- attempts to take a cross section of a population at the current time 2. Retrospective study- looks into the past 3. Prospective study- follows its subjects into the future  Case-control study- a retrospective observational study in which subjects who have a response outcome of interest (the cases) and subjects who have the other response outcome (controls) are compared on an explanatory variable  Block-set of experimental units that are matched with respect to one or more characteristics  Randomized block design (RBD)- when the random assignment of experimental units to treatments is carried out separately within each block  Matched pair-two observations for a particular subject  Population- entire group of individuals about which information is wanted  Sample- the part of the population actually examined to gather information  Simple random sampling (SRS)- a simple random sample of size N consists of N individuals from the population chosen in such a way that every set of N individuals has an equal chance of veing selected  Stratified random sampling- population is dived into important subgroups which are groups of individuals or subjects that are similar in a way that may affect
More Less

Related notes for ASTRO 001

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.