statistical tests

Question 1

parametric tests

Answer 1

-relies upon the assumption that the data you want to test is (or approximately is) normally distributed
-interval level data

Question 2

non-parametric test

Answer 2

-determine the value of data points by assigning + or - signs based on the data ranking
-less powerful than parametric tests

Question 3

when use a related T- test

Answer 3

-used in studies with a repeated measures or a matched pairs design, where the data meets the requirements for a parametric test
-interval data
-N in formula means sample size

Question 4

when use unrelated T- test

Answer 4

-with independent measures
-interval data (parametric)

Question 5

when use sign test

Answer 5

-test of difference between pared data e.g. repeated measures
-nominal data
-calculated value must be equal to or less than critical

Question 6

when use chi-squared test

Answer 6

-difference or association
-only nominal, unrelated data
-calculated value must be equal to or greater than critical

Question 7

when use wilcoxon

Answer 7

-test of difference
-ordinal data
-related data
-calculated value must be equal to or less than critical

Question 8

when to use spearmans rho

Answer 8

-test of association
-ordinal data
-looking for correlation
-calculated value must be equal to or higher than critical
-order of points, do all increase

Question 9

when to use pearsons r

Answer 9

-test of association
-correlation
-interval data
-calculated must be equal to or higher than critical
-close to straight line