data collection

Question 1

• First problem a statistician faces: how to obtain the data.
• It is important to obtain good, or representative, data.
• Inferences are made based on statistics obtained from the data.
• Inferences can only be as good as the data.

Answer 1

Data Collection

Question 2

• Information which are gathered directly from an original source or which are based on direct or first-hand experience.
• Autobiographies, Diaries

Answer 2

Primary Data

Question 3

• Information which are taken from published or unpublished data which were previously gathered by other individuals or agencies.
• Newspaper, Books, magazines, business reports)

Answer 3

Secondary Data

Question 4

Advantages of Secondary Data

Answer 4

• Direct Observation
• Experiment Method
• surveys with personal interview, telephone interview, and self-administered survey
• census

Question 5

advantages of primary data

Answer 5

> Frequently give detailed definitions of terms and accurate statistical units used in the survey.
Lend more relevance to the researcher’s study because of his direct participation in the project.
More reliable because of their first-hand nature.

Question 6

sampling can be?

Answer 6

with replacement and without replacement

Question 7

sampling methods:

Answer 7

probability sampling and non probability sampling