Collecting Data

​Collecting Data

​Learning Objectives

​After studying this material, students will be able to:

• ​select a method to collect data to answer a number of linked questions

• consider the different types of data​

• ​consider different sampling methods.

Collecting Data

• ​What data need to be collected?

• What type of data it is?

• ​What method is used to collect the data?

​Types of Data

​Discrete data: Data from counting, exp: number of students, number of teachers.

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Continuous Data: Data from measuring, exp: temperature, height​

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Categorical Data: Non-number data, exp: favorite food, colour of cars​

Open Ended

Give an example of discrete data

Open Ended

Give an example of continu data

Open Ended

Give an example of categorical data

Open Ended

Give an example about observation

Open Ended

Give an example about interview

Open Ended

Give an example about questionnaire

Open Ended

Give an example about database

​Discuss with your pair

​Do we need to ask all people?

​Population, Sample and Sampling

​Population: a discrete group of people, animals or things that can be identified by at least one common characteristic for the purposes of data collection and analysis.

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Sample: a small part or quantity of a population intended to show what the whole population is like.

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Sampling: ​the action or process of taking samples of something for analysis.

​Population and Sample

​Discuss!!