MMW LESSON 6

DATA MANAGEMENT

DEVELOPMENT, EXECUTION, AND SUPERVISION OF PLANS, POLICIES, PROGRAMS AND PRACTICES THAT CONTROL, PROTECT, DELIVER AND ENHANCE THE VALUE OF DATA AND INFORMATION ASSETS.

STATISTICS

A BRANCH OF MATHEMATICS DEALING WITH THE COLLECTION, ORGANIZATION, PRESENTATION, ANALYSIS, AND INTERPRETATION OF DATA.

DESCRIPTIVE STATISTICS

DEALS WITH THE METHOD OF ORGANIZING, SUMMARIZING, AND PRESENTING DATA.

INFERENTIAL STATISTICS

CONCERNED WITH MARKING GENERALIZATIONS ABOUT THE CHARACTERISTICS OF A LARGER SET WHERE ONLY A PART IS EXAMINED.

POPULATION

COLLECTION OF ALL THE ELEMENTS UNDER CONSIDERATION IN A STATISTICAL STUDY.

SAMPLE

A PART OF A SUBSET OF THE POPULATION FROM WHICH THE INFORMATION IS COLLECTED.

PARAMETER

ANY NUMERICAL VALUE DESCRIBING THE CHARACTERISTIC OF A POPULATION.

STATISTIC

ANY NUMERICAL VALUE DESCRIBING THE CHARACTERISTIC OF A SAMPLE.

VARIABLE

A CHARACTERISTIC OR ATTRIBUTE OF PERSONS OR OBJECTS WHICH CAN ASSUME DIFFERENT VALUES OR LABELS FOR DIFFERENT PERSONS OR OBJECTS UNDER CONSIDERATION.

QUALITATIVE VARIABLE

VARIABLE THAT YIELDS CATEGORICAL RESPONSES.

QUANTITATIVE VARIABLE

VARIABLE THAT TAKES ON NUMERICAL VALUES REPRESENTING AN AMOUNT OR QUANTITY.

DISCRETE QUANTITATIVE VARIBALE

VARIABLE WITH A FINITE OR COUNTABLE NUMBER OF POSSIBLE VALUES.

CONTINUOUS QUANTITATIVE VARIABLE

VARIABLE WHICH CAN ASSUME INFINITELY MANY VALUES CORRESPONDING TO A LINE INTERVAL.

MEASUREMENT

PROCESS OF DETERMINING THE VALUE OR LABEL OF A PARTICULAR VARIABLE.

NOMINAL

DATA COLLECTED ARE LABELS, NAMES, OR CATEGORIES.

ORDINAL

DATA COLLECTED ARE LABELS WITH IMPLIED ORDERING.

INTERVAL

DATA AT THIS LEVEL MAY LACK AN ABSOLUTE ZERO POINT.

RATIO

THE NUMBER “0” INDICATES THE ABSENCE OF THE CHARACTERISTIC.

FREQUENCY DISTRIBUTION TABLE (FDT)

USED TO SUMMARIZE BOTH QUALITATIVE AND QUANTITATIVE DATA.

RAW DATA

SET OF DATA IN ITS ORIGINAL FORM.

ARRAY

ARRANGEMENT OF OBSERVATIONS ACCORDING TO THEIR MAGNITUDE, EITHER IN INCREASING OR DECREASING ORDER.

CLASSES

MUTUALLY EXCLUSIVE CATEGORIES DEFINING THE LOWER LIMIT AND THE UPPER LIMIT.

CLASS LIMITS

END NUMBERS OF THE CLASS.

CLASS FREQUENCY (f)

NUMBER OF OBSERVATIONS FALLING IN THE CLASS.

CLASS BOUNDARIES

TRUE CLASS LIMITS

LOWER CLASS BOUNDARY

IS USUALLY DEFINED AS HALFWAY BETWEEN THE LOWER CLASS LIMIT OF THE CLASS AND THE UPPER CLASS LIMIT OF THE PRECEDING CLASS.

UPPER CLASS BOUNDARY

IS USUALLY DEFINED AS HALFWAY BETWEEN THE UPPER CLASS LIMIT OF THE CLASS AND THE LOWER CLASS LIMIT OF THE NEXT CLASS.

CLASS MARK

MIDPOINT OF A CLASS INTERVAL.

RELATIVE FREQUENCY

TELLS THE PERCENTAGE OF OBSERVATIONS IN A PARTICULAR CLASS OF INTEREST.

LESS THAN CUMULATIVE FREQUENCY

TOTAL NUMBER OF OBSERVATIONS LESS THAN THE UCB.

GREATER THAN CUMULATIVE FREQUENCY

TOTAL NUMBER OF OBSERVATIONS GREATER THAN THE LCB.