Podcast
Questions and Answers
Which of the following statements is NOT correct?
Which of the following statements is NOT correct?
- A population is the entire group you want to draw conclusions about.
- A sampling frame is a list of sampling units from which you select your sample.
- The sampling frame always matches the target population. (correct)
- A sample is the specific group that you will collect data from.
A hotel sent a survey to 190 members of their loyalty program. Of those, 115 completed the survey. What is the sample?
A hotel sent a survey to 190 members of their loyalty program. Of those, 115 completed the survey. What is the sample?
- All hotel guests.
- All loyalty program members.
- The 190 members who received the survey.
- The 115 members who completed the survey. (correct)
Which of the following statements is NOT correct about probability sampling?
Which of the following statements is NOT correct about probability sampling?
- It is based on randomization.
- It is likely to generate a representative sample.
- It is less time-consuming than non-probability sampling. (correct)
- It can reduce sampling biases.
Which of the following statements is correct about stratified random sampling?
Which of the following statements is correct about stratified random sampling?
A researcher surveyed every 5th customer who entered the restaurant throughout the week. Which sampling technique is being used?
A researcher surveyed every 5th customer who entered the restaurant throughout the week. Which sampling technique is being used?
A researcher wanted to study household energy usage, so they randomly selected 10 neighborhoods and surveyed every household in each. Which sampling technique is being used?
A researcher wanted to study household energy usage, so they randomly selected 10 neighborhoods and surveyed every household in each. Which sampling technique is being used?
A researcher interviewed one book collector, who referred them to others. Which sampling technique is being used?
A researcher interviewed one book collector, who referred them to others. Which sampling technique is being used?
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Study Notes
Sample
- The sample refers to the group of individuals who actually participate in the study.
- In this case, the sample is the 115 members who completed the hotel's loyalty program survey.
Probability Sampling
- Probability sampling ensures that each member of the population has a known, non-zero chance of being selected for the sample.
- It allows for generalization of findings from the sample to the larger population.
Stratified Random Sampling
- Stratified random sampling involves dividing the population into subgroups (strata) based on shared characteristics.
- Then, random samples are selected from each stratum, ensuring representation of all subgroups in the final sample.
Systematic Sampling
- Systematic sampling selects individuals at regular intervals from a list of the population.
- In this case, every 5th customer entering the restaurant is selected.
Cluster Sampling
- Cluster sampling involves dividing the population into clusters (often geographically defined groups).
- Then, clusters are randomly selected, and all individuals within the selected clusters are included in the sample.
Snowball Sampling
- Snowball sampling relies on referrals from initial participants to find additional participants.
- It is helpful when targeting specific, hard-to-reach populations.
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