2023 Sampling methods

Identify the sampling method

Students wanted to interview different groups of tourists, domestic and international, along Marina Bay. Students decided to interview the 1st 20 domestic tourists and 20 international tourists that they encountered

• Quota

• Convenience

• Systematic

• Simple random

Student-researchers wanted to better understand the mental health awareness in the school. Using a list with all the student names, a random number generator was used to select 50 students to participate in a survey

• Convenience

• Simple stratified

• Simple

• Systematic

Students wanted to interview residents on their perception of Orchard Road. They divided themselves into pairs and stood along different parts of Orchard.

Each pair stood across each other to form a transect and approached every 10th person who walked past them.

What sampling method is this?

• Convenience

• Quota

• Systematic

• Simple random

Students wanted to investigate how environmentally conscious residents of Woodlands are. Students went into the neighbourhood and interviewed the 1st 50 respondents they could find and approached them to complete a questionnaire survey.

What sampling method is this?

• Systematic

• Simple random

• Quota

• Convenience

What is the difference between Quota sampling and Convenience sampling?

• Convenience sampling chooses people most accessible to them whilst Quota requires a random number generator

• Quota sampling is a probability based sampling method but Convenience is not

• Quota sampling requires a sub-group whilst convenience sampling is free to choose anyone

Which statement about systematic sampling is incorrect?

• Person chosen may not be representative of the population

• Every person get an equal chance to be chosen.

• Quick and cheap way of data collection

• Often conducted in places with heavy human traffic

Which statement about convenience sampling is not true?

• Fastest data sampling method

• Representative of the population

• Researcher select whomever they want

• Researcher bias is prevalent (Researcher may be bias to a type of person)

Student were tasked to interview students about what can be improved in the school. During recess, they approached 100 respondents who were most accessible and ensured that all levels were equally represented (25 respondents from each level).

• Systematic

• Random

• Stratified random

• Quota