module 6 comparison groups

Question 1

independent groups

Answer 1

scores are separate from each other

- different people

Question 2

dependent/ paired groups

Answer 2

scores are linked

• same person
• married couple
• pre/post test

Question 3

Parametric tests

Answer 3

used with interval or ratio level data
normal or near-normal distribution
- independent t-test
- dependent t- test

Question 4

non-parametric tests

Answer 4

used with ordinal or nominal data or when ratio/interval level data is skewed

• Mann-whitney U test
• Wilcoxon signed rank test (matched pairs)

Question 5

assumption for t test

Answer 5

samples must be randomly selected
interval or data level
normal or near normal distribution

Question 6

first steps

Answer 6

state null and alternative hypotheses

consider the number of groups, level of data, and number of time points

Question 7

null

Answer 7

there is no difference

Question 8

alternative

Answer 8

there is a difference

Question 9

p>a

Answer 9

fail to reject the null

Question 10

p<a></a>

Answer 10

reject the null