GALAXY HUNTER

The Hubble Deep Field North (HDF-N)-- For being the faintest universe in visible light, it has the the deepest, sharpest, and most multi-colored images. The images were made by pointing the HUBBLE telescope at a empty point in the northern sky close to the big dipper for a period of tens days during DECEMBER in 1995. At this time, they discovered about 1 thousand never-before-seen galaxies that are visible in this view of the universe.

The Hubble Deep Field South (HDF-S)-- It is complements the original Hubble Deep Field (HDF-N) taken in late 1995. The constellation Tucana can only be viewed from the southern hemisphere. This was a 10 day long observation in October 1998. These observations doubled the number of far-flung galaxies available to astronomers for figuring out the history of the universe.

Bias Decisions -- Samples that are chosen by humans, are always susceptible to bias. Unconsciously, we base our choices on a trait or quality of the sample member. Selection of samples that is made by computers are considered to be unbiased. In database sampling, each of the galaxies are assigned a number. The computer collects a sample of galaxies by randomly choosing numbers.Computer-generated sample comes closest to the astronomers’ actual result. A computer is the best tool for avoiding inevitable human bias.

How many galaxies are enough? -- Usually we can not sample a whole population at one time. So instead we look for the smallest reasonable sample. The secret behind what is "reasonable" lies in the variability of samples. You can not expect to receive the exact same results if five different samples of the same sample size were taken.

STATS--

RANGE is the simplest measure of dispersion. It is the interval between the highest-valued (largest) piece of data and the lowest-valued (smallest) one, expressed as the difference between them.

MIN/MAX PLOT is A visual representation of the range. It shows the dispersion of the data by using a line to connect the lowest-valued (smallest) piece of data to the highest-valued (largest).

MEASURE OF CENTRAL TENDENCY is Numerical values that are located, in some sense, in the middle of a sample or population. These include the mean, median, and mode.