Statistics For Dummies, 2nd Edition. If a statistical data set has a normal distribution, it is customary to standardize all the data to obtain standard scores known as z-values or z-scores. The distribution of z-values takes on a standard normal distribution (or Z-distribution). The standard normal distribution is a special normal distribution with a mean equal to 0 and a standard deviation equal to 1. A standard normal (Z-) distribution has a bell-shaped curve with mean 0 and standard deviation 1. The standard normal distribution is useful for examining the data and determining statistics like percentiles, or the percentage of the data falling between two values.
Antioch is one of the oldest towns in California. In 1848, John Marsh, owner of Rancho Los Meganos, one of the largest ranches in California, built a landing on the San Joaquin River in what is now Antioch. It became known as Marsh's Landing, and was the shipping point for the 17,000-acre rancho.
Originally named Smithâs Landing, Antioch began as a settlement along the banks of. the San Joaquin River in 1850, and was incorporated in 1872. Antioch is located in. eastern Contra Costa County between the Cities of Brentwood and Oakley on the. east, and Pittsburg on the west. The City encompasses approximately 28 square miles, has 32 square miles within its Sphere of Influence, and 35 square miles within its Planning. Area.