EMPA Stats Flashcards
1
Q
When is chi square used?
A
Investigation involves finding the number of individuals in
particular categories
2
Q
When is Spearman’s rank correlation used?
A
When looking for associations between different
measurements from the same sample
3
Q
When is Standard Error used?
A
When looking for differences between mean values
4
Q
Write the equation for Standard Error
A
SD/ root n
5
Q
95% confidence limits =
A
2 × SE above and below the mean
6
Q
Write the equation for chi squared
A
Σ(O –E)squared over E
7
Q
What does O and E represent in the equation?
A
O = results observed E = results you expect
8
Q
Write the equation for Spearman’s Rank
A
= 1 – 6 × Σ D2/ n3–n
9
Q
What does n and D stand for in equation?
A
n is the number of pairs of items in the sample and D is the difference between each pair of ranked measurements
