Understanding Biased and Unbiased Samples Quiz

A researcher selects a sample of 100 students from a local high school by choosing the first 100 students who enter the school one morning. Is this sample likely to be biased or unbiased?

• Biased

• Unbiased

To understand the average height of adults in a city, a surveyor randomly selects 500 adults from the entire adult population of the city. Is this sample likely to be biased or unbiased?

• Biased

• Unbiased

A pollster wants to gauge the popularity of a new law among citizens. They decide to only survey members of a political party that publicly supports the law. Is this sample likely to be biased or unbiased?

• Biased

• Unbiased

In a study to determine the average time teenagers spend on social media, researchers select participants by posting an online survey on a popular social media platform. Is this sample likely to be biased or unbiased?

• Biased

• Unbiased

A scientist researching sleep patterns sends out a survey to a random selection of 1,000 people from a national database. Is this sample likely to be biased or unbiased?

• Biased

• Unbiased

To estimate the percentage of households in a city that recycle, a survey is conducted by randomly selecting phone numbers from the city's phone directory. Is this sample likely to be biased or unbiased?

• Biased

• Unbiased

A company wants to assess employee satisfaction. They randomly select 30 employees from each department to participate in a survey. Is this sample likely to be biased or unbiased?

• Biased

• Unbiased

A health researcher is studying the effects of a diet on health outcomes. They recruit participants from a local gym. Is this sample likely to be biased or unbiased?

• Biased

• Unbiased

To determine the average number of books people read in a year, a survey is conducted at a local library, asking every fifth visitor about their reading habits. Is this sample likely to be biased or unbiased?

• Biased

• Unbiased

A market research company wants to understand the preferences of smartphone users. They randomly select 2,000 smartphone users from a national consumer database. Is this sample likely to be biased or unbiased?

• Biased

• Unbiased