ED Basics

Question 1

Why is experimental design important? (4)

Answer 1

is a fundamental part of science

can help overcome time, money & ethical issues

helps overcome own bias

reduce random variation

Question 2

What is a confounding variable?

Answer 2

a 3rd variable that effects the two others

Question 3

what is a covariant?

Answer 3

a 3rd v variable that effects only the independent variable

Question 4

Simpsons paradox defintion

Answer 4

when a trend appears when data is in groups but disappears when the data are combined

Question 5

When does Simpsons paradox often occur

Answer 5

When data is mistreated and there is little or poor ED in effect (confounding variables accounted for)