Math Glossary Letter H
half-dollar
Currency unit worth 50 cents
half-life
time required for a quantity to reduce to half its initial value
hardy-weinberg
allele and genotype frequencies in a population will remain constant from generation to generation
harmonic mean
reciprocal of the arithmetic mean of the reciprocals of the given set of observations
harmonic sequence
sequence of real numbers formed by taking the reciprocals of an arithmetic progressio
HDL
High Density Lipoproteins - a good cholesterol
health
functional and metabolic efficiency of humans
heart
Organ which pumps blood
heat index
measure of how hot it really feels when relative humidity is factored in with the actual air temperature
hectare
unit of area equal to 100 ares
heptagon
seven sided figure
Herfindahl Index
accepted measure of market concentration.
Herons Formula
formula to find the area of a triangle using the 3 side lengths

S = (A + B + C)/2; A = sqrt(S(S - A)(S - B)(S - C))
hertz
unit of frequency in the International System of Units (SI) and is defined as one cycle per second
hexadecimal
Base 16 number system
hexagon
six sided figure
high and low method
taking the highest level of activity and the lowest level of activity and comparing the total costs at each level
highly suspect outliers
Values below 3 * Interquartile Range below the lower quartile or Values above 3 * Interquartile Range above the upper quartile
hinge
object used to mount and operate doors
horizontal component
x portion of a vector
hour
Unit of time equal to 60 minutes
hue
color shade
hyperbola
conic section defined as the locus of all points in the plane the difference of whose distances and from two fixed points
hypergeometric distribution
discrete probability distribution that describes the probability of k successes (random draws for which the object drawn has a specified feature) in ndraws, without replacement
hypothesis
statistical test using a statement of a possible explanation for some conclusions
hypothesis testing for a proportion
hypothesis testing for the mean