Survey Methodology and Sampling Bias

The video tutorial discusses data collection methods, focusing on surveys, census, and sampling. It explains the concept of target population and the challenges of conducting a census, such as cost and time. The tutorial contrasts this with sampling, highlighting its advantages and potential biases. Real-world examples like workplace surveys, election polls, and TV ratings illustrate these concepts. The video also covers different data collection methods and their associated biases.

What is the primary purpose of identifying a target population in a survey?

• To simplify the survey process

• To ensure the survey is cost-effective

• To determine who the survey questions are relevant to

• To increase the number of survey participants

What is a major disadvantage of conducting a census?

• It introduces sample bias

• It only targets a small portion of the population

• It is time-consuming and expensive

• It is less accurate than sampling

How does sampling address the challenges of a census?

• By asking everyone in the population

• By reducing costs and time required

• By eliminating all forms of bias

• By ensuring 100% accuracy

What is a potential problem with using a small sample size in surveys?

• It increases the cost of the survey

• It may not represent the entire population accurately

• It eliminates the need for data analysis

• It guarantees accurate results

In the context of election polls, what does a sample represent?

• A small group of voters used to predict overall trends

• The entire voting population

• Only the voters who have already decided

• The total number of votes cast

How do TV ratings companies like AC Nielsen estimate viewership numbers?

• By counting every viewer individually

• By surveying only the most popular shows

• By using a sample of households and extrapolating

• By asking viewers to report their own viewing habits

What is sample bias?

• A method to increase survey accuracy

• A type of bias introduced by the way a sample is selected

• A technique to reduce survey costs

• A strategy to ensure all demographics are included

Which survey method is typically the most expensive?

• Phone interviews

• Paper questionnaires

• Online surveys

• Face-to-face interviews

What issue might arise from conducting a phone survey at 10:00 a.m. on a Monday?

• It will reach a diverse audience

• It will ensure a high response rate

• It will be the most cost-effective method

• It may skew results towards retirees and non-working individuals

Why might conducting a survey at a train station introduce bias?

• It eliminates the need for data analysis

• It targets only people who use public transportation

• It ensures a random sample of the population

• It is the most efficient way to gather data