Formulas Flashcards
1
Q
Formula for 95% confidence interval
A
Mean +/- 1.96 * SD / square root of n (sample size)
2
Q
Formula for 99% CI
A
Mean +/- 2.58* SD / square root of n
2.58 is the z score for a 99% CI
3
Q
Cardiac Output
A
CO = SV x HR
4
Q
Law of conservation of mass (flow in must = flow out)
A
A1 x V1 = A2 x V2 (area and velocity of a tube)
5
Q
Ejection Fraction
A
EF = SV / EDV (normal should be > 55%)
6
Q
Resistance to flow
A
resistance is inversely proportional to the radius to the 4th power
