Statistics is the science of collecting and analyzing numerical data gathered from a representative sample in order to infer the true mean or proportion of a population. The x-bar_ is the symbol (or expression) used for the sample mean statistics.
Base salary is a fixed amount of money paid to an employee by an employer in return for work performed. Base salary does not include benefits, bonuses or any other potential compensation from an employer.
Base pay can be expressed in terms of an hourly rate of pay, such as $10.15 per hour, or it can be expressed in a number of other different forms. If you work on a salary basis, your base pay may be expressed as a monthly figure such as $4,000 per month, or on a yearly basis as $48,000 per year.