The database commonly uses an index range scan to access selective data. The selectivity is the percentage of rows in the table that the query selects, with 0 meaning no rows and 1 meaning all rows. Selectivity is tied to a query predicate, such as WHERE last_name LIKE 'A%', or a combination of predicates.
Types of Distribution: Intensive, Selective and Exclusive Distribution. Some of the important types of distribution in international market are 1. Intensive 2. Selective and 3. Exclusive distribution.
Specific Types of Normal Distributions commonly used in psychology. Psychologists refer to these distributions often because there is a common reference for understanding raw scores of these particular distributions : The Z distribution: The Z distribution has a mean of 0 and a standard deviation of 1.e convert the raw scores of the sample group into percentiles in order to construct a normal distribution to allow us to rank future test takers. Norms are not standards of performance, but serve as a frame of reference for test score interpretation.