Equations Flashcards
1
Q
Standard Error
A
SD/sqrt(N)
2
Q
Standard Deviation Vs Standard Error
A
SD-Biological Variability
SEM-Equipment Variability
3
Q
Confidence Interval
A
CI=X+/-(SEM+1.96)
4
Q
Grubbs Test
A
To find the outlier. If score is larger than p-value it is an outlier.
Z=(mean-value)/SD
5
Q
Z/t statistic
A
Z/t= (Mp-Ms)/ (SD/(sqrt(N)))
6
Q
T-test
A
T= M1-M2/(Sqrt(SE1^2+SE2^2))
7
Q
Df for a T-Test
A
2N-2
8
Q
Expected for Box X
A
(Ct+Rt)/N
9
Q
Calculated X^2
A
Needs to be higher than .05 critical value
X^2= [Sum] (Obs-Exp)^2/Exp
10
Q
Odds Ratio
A
Used for Case Control studies
Odds of Exposure
AD/BC
11
Q
Relative Risk
A
RR= Exposed/Non-exposed
12
Q
Relative Risk Reduction
A
RRR= (Healthy-Exposed)/ Healthy
13
Q
Absolute Risk Reduction
A
ARR= Healthy- Exposed
14
Q
Number Needed to Treat
A
NNT= 1/ARR
15
Q
Sensitivity
A
Senstivity= a/(a+c)
