stats and numbers - p1 Flashcards
When would you use the correlation coefficient?(spearman rank)
investigating ASSOCIATION between two measurements
When would you use the student T test?
investigating a DIFFERENCE between two means
When would you use chi2 test?
investigating a difference in frequencies
if the Rs value is -1 there is…
if the Rs value is 0 it is…
if the Rs value is +1 there is…
a perfect negative
no correlation
a perfect positive correlation
if calculated value is greater than critical value than…
significant evidence, reject null hypothesis
if p value is >0.05 than…
more than 5% probability the increase was due to chance.
(accept null hypothesis)
chi squared test used when investigating…
difference in frequencies of individuals in a category
percentage error
observed / expected x 100
