Chapter 1 Data Collection Flashcards Preview

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Flashcards in Chapter 1 Data Collection Deck (24):
1

SECONDARY DATA

DATA THAT HAS ALREADY BEEN COLLECTED.

INTERNET, MAGAZINE NEWSPAPERS

2

PRIMARY DATA

DATA COLLECT BY YOURSELF. YOU CAN ASK PEOPLE QUESTIONS OR CARRY OUT AN EXPERIMENT

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QUALITATIVE

DESCRIBED IN WORDS ONLY AND USUALLY ORGANISED IN TO CATEGORIES

4

QUANTITATIVE

NUMERICAL VALUES i.e shoe sizes, temperature.

5

HYPOTHESIS

A STATEMENT THAT HELPS TO ANSWER A QUESTION. IT MUST GIVE AN ANSWER WHICH IS TRUE OR FALSE AND MUST BE MEASURABLE

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DISCRETE

CAN ONLY HAVE CERTAIN VALUES, USUALLY WHOLE NUMBERS OR FRACTIONS

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CONTINUOUS

CAN TAKE ANY VALUE IN A RANGE AND CAN BE MEASURED

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GROUPED DATA

DATA GROUPED TOGETHER I.e frequency table.

9

CLASS INTERVALS

A RANGE OF GROUPED NUMBERS I.e 1-5, 6-10

10

CLASS INTERVALS FOR CONTINUOUS DATA

USE INEQUALITIES

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WHY LEARN TWO-WAY TABLES?

TO RECORD TWO SETS OF DATA IN A CLEAR WAY

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TO FIND OUT INFORMATION

SURVEY

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HOW TO COLLECT PRIMARY DATA

USE A QUESTIONNAIRE

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HOW SHOULD A QUESTION BE RESPONDED TO?

YES OR NO

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LEADING QUESTION

ENCOURAGES TO GIVE A PARTICULAR ANSWER

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CENSUS

GATHERS INFORMATION FROM ALL POSSIBLE SOURCES

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POPULATION

THE TOTAL NUMBER OF PEOPLE YOU COULD BE INVESTIGATING

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SAMPLE

THE GROUP OF PEOPLE ASKED

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REPRESENTATIVE

A SAMPLE THAT GIVES A FAIR AND BALANCED RANGE OF PEOPLES OPINIONS

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RANDOM

GIVES POPULATION EQUAL CHANCE OF BEING SELECTED

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BIASED

A SAMPLE THAT IS NOT REPRESENTATIVE OF THE POPULATION

22

STRATIFIED

DIVIDES POPULATION IN TO GROUPS THEN TAKES A RANDOM SAMPLE FROM EACH GROUP.

23

SAMPLING FRACTION

NUMBER TAKEN FROM STRATIFIED SAMPLE GROUPS. IS THE SAME FRACTION OF THE GROUO AS THE SAMPLE SIZE IS OF THE POPULATION.

24

HOW TO CALCULATE STRATIFIED SAMPLE SIZE

DEFINE SAMPLE SIZE, FIND FRACTION, USE DENOMINATOR TO DIVIDE NUMBER, NUMBER GIVEN PER GROUP REQUIRED.