Samples and populations

Why is a sample of a population often selected instead of conducting a census?

• To ensure biased results
• To save time and cost
• To include every member of the population
• To collect more accurate data

Which of the following is an example of a double-barrelled question?

• Do you agree that the school should have more funding for sports and arts programs?
• How often do you exercise and for how long?
• What is your favorite color and why?
• Do you prefer pizza or pasta?

What is the purpose of designing a survey?

• To collect numerical data only
• To avoid collecting data
• To create a biased sample
• To gather opinions from a specific group of people

Which of the following is NOT a way to generate a random number?

• Using Excel
• Using a random number generator
• Using a calculator
• Using a ruler

What is the purpose of a census?

• To collect more accurate data
• To save time and cost
• To ensure biased results
• To obtain an accurate profile of a population

What is the purpose of using a random number generator when selecting a sample?

• To ensure that the sample is larger than the population
• To ensure that the sample is representative of the population
• To ensure that the sample is smaller than the population
• To ensure that the sample is biased

Which of the following is an example of an open question?

• What is your favorite color?
• Do you prefer cats or dogs?
• What is your favorite movie?
• How many siblings do you have?

What is the purpose of designing a questionnaire?

• To make the collected data easy to analyze
• To save time and cost
• To include every member of the population
• To ensure biased results

What is the recommended size of a sample in relation to the population size to avoid bias?

• Twice the population size
• Half the population size
• Approximately the square root of the population size
• Equal to the population size

What type of data should be collected in a survey?

• No data at all
• Only categorical data
• Only numerical data
• Both categorical and numerical data