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Emory University - QTM 100 - Class Notes - Week 1

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Types of study Designs

Feb

1,16

- experimental study researchers assign subjects

to experimental conditions & then the response / outcome of interest is observed - experimental' conditions can be called the atments

+ Observational study researchers observe both response and explanatory variable w/o assighing a treatment (non-experimental)

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X can study effect of explanatory variable on

response variable more accurately in

experimental Study - How to select partipants * Want participants to be a representative

sample of population so results can be generalized to population We also discuss several other topics like What is audience-centered process?

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If you want to learn more check out How do i find the derivative of a function?

If you want to learn more check out How do you find the minimum and maximum value of a data set?

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-Bias = present when results of sample arent

representative of population

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sampling bias (coverage bias) - result from sample method * sample may not be random

* sample doesnt rep pop (undercoverage) Nonresponse blas - subjects refuse to participate X different characteristics of subjects * generates missing data if subjects choose If you want to learn more check out How do you find the slope of a curve at a point?

not to answer some questions

| Response bias - subjects give inaccurate data

x subjects may lie - questions subjective reading!

Study Design (cont)

Feb 1,16

confounding vanable - Athind variable that

allects both the explanatory and lesponse variable amakes it seem like there is a connection x in observational studies, association doernt If you want to learn more check out Define resonance.

imply causation!

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EX - Spanking de low IQ , contounding could be:

- parent 1Q/ environment, affluence, etc....

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Key concepts in Experimental Design

control - compare treatment of interest to control group 2 Randomize-randomly assign subjects 3 Replicate - collect sufficiently large sample size 4 Block - account for variabler known/suspected to

affect response of interest

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A comparing results between treatment a control group

allows us to determine it an intervention was elective We also discuss several other topics like What are the types of statements and how they differ?

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Terminology tplacebo- Pake treatment, often used as control group tplacebo ellect - show change despite being on placebo -blinding experimental units do not know which

group they're in de it double-blind - both experimental units an experimenter

do not know the group assignments multifactor experiments - Categorical explanatory variables in an experiment may be refiered to as

factors - sometimes its of interest to test the effects of multiple factors