Chapter 1 Data Collection Flashcards
SECONDARY DATA
DATA THAT HAS ALREADY BEEN COLLECTED.
INTERNET, MAGAZINE NEWSPAPERS
PRIMARY DATA
DATA COLLECT BY YOURSELF. YOU CAN ASK PEOPLE QUESTIONS OR CARRY OUT AN EXPERIMENT
QUALITATIVE
DESCRIBED IN WORDS ONLY AND USUALLY ORGANISED IN TO CATEGORIES
QUANTITATIVE
NUMERICAL VALUES i.e shoe sizes, temperature.
HYPOTHESIS
A STATEMENT THAT HELPS TO ANSWER A QUESTION. IT MUST GIVE AN ANSWER WHICH IS TRUE OR FALSE AND MUST BE MEASURABLE
DISCRETE
CAN ONLY HAVE CERTAIN VALUES, USUALLY WHOLE NUMBERS OR FRACTIONS
CONTINUOUS
CAN TAKE ANY VALUE IN A RANGE AND CAN BE MEASURED
GROUPED DATA
DATA GROUPED TOGETHER I.e frequency table.
CLASS INTERVALS
A RANGE OF GROUPED NUMBERS I.e 1-5, 6-10
CLASS INTERVALS FOR CONTINUOUS DATA
USE INEQUALITIES
WHY LEARN TWO-WAY TABLES?
TO RECORD TWO SETS OF DATA IN A CLEAR WAY
TO FIND OUT INFORMATION
SURVEY
HOW TO COLLECT PRIMARY DATA
USE A QUESTIONNAIRE
HOW SHOULD A QUESTION BE RESPONDED TO?
YES OR NO
LEADING QUESTION
ENCOURAGES TO GIVE A PARTICULAR ANSWER
CENSUS
GATHERS INFORMATION FROM ALL POSSIBLE SOURCES
POPULATION
THE TOTAL NUMBER OF PEOPLE YOU COULD BE INVESTIGATING
SAMPLE
THE GROUP OF PEOPLE ASKED
REPRESENTATIVE
A SAMPLE THAT GIVES A FAIR AND BALANCED RANGE OF PEOPLES OPINIONS
RANDOM
GIVES POPULATION EQUAL CHANCE OF BEING SELECTED
BIASED
A SAMPLE THAT IS NOT REPRESENTATIVE OF THE POPULATION
STRATIFIED
DIVIDES POPULATION IN TO GROUPS THEN TAKES A RANDOM SAMPLE FROM EACH GROUP.
SAMPLING FRACTION
NUMBER TAKEN FROM STRATIFIED SAMPLE GROUPS. IS THE SAME FRACTION OF THE GROUO AS THE SAMPLE SIZE IS OF THE POPULATION.
HOW TO CALCULATE STRATIFIED SAMPLE SIZE
DEFINE SAMPLE SIZE, FIND FRACTION, USE DENOMINATOR TO DIVIDE NUMBER, NUMBER GIVEN PER GROUP REQUIRED.
