How to Sample Badly

How to Sample Badly

Start by watching this video

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Multiple Choice

The process of gathering information/data from EACH member of the population.

• Census
• Interview
• Survey
• Questionnaire

Multiple Choice

Which scenario would produce the least biased results?

• asking athletes at a gym what their favorite television show is
• asking shoppers at a store where their favorite place to shop is
• asking fans at a baseball game who their favorite baseball team is
• asking students in a college library what their favorite college sports team is

Multiple Choice

Mrs. Delgado asks the first ten students at Clinton Elementary about what they think the new school's mascot should be. Identify the population and sample.

• Population: First ten students

  Sample: All students at Clinton Elementary

• Population: All students at Clinton Elementary

  Sample: First ten students

Multiple Choice

A school principal wants to offer an after-school club setting. She decided to survey 300 students about this. Which word best describes the group of 300 students?

• Population

• Sample

• Census

• Prediction

Multiple Choice

_______ is the entire group of objects or individuals considered for a survey.

• Sample
• Population
• Random Sample
• Quartile

Multiple Choice

Identify the Population:

A restaurant wants to know if customers buy dessert when they eat out. As people leave the restaurant one evening, 20 people are surveyed at random. Eight people say they usually order dessert when they eat out. The restaurant concluded that most customers do not order dessert.

• 20 customers who are surveyed

• All customers who eat at this restaurant

• 8 customers who buy dessert

• Dessert

Time for a Second Video

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Multiple Choice

Exit polls (where the surveyor asks those who are leaving the poll booths on election day) are a form of:

• Voluntary Response
• Convenience Sampling
• Simple Random Sampling
• Systematic Sampling

Multiple Choice

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects the first five who raise their hands.

• Systematic
• Convenience
• Voluntary Response
• Simple Random

Multiple Choice

Source of bias in which people CHOOSE to respond and usually only people with very strong opinions respond

• Response Bias
• Undercoverage
• Convenience Sampling
• Voluntary Response

Multiple Choice

Source of bias in which some groups of populations are LEFT OUT of the selection process

• Response Bias
• Undercoverage
• Convenience Sampling
• Voluntary Response

Multiple Choice

Source of bias that occurs when an individual chosen for the sample CAN'T be contacted or refuses to cooperate.

• Response Bias
• Undercoverage
• Nonresponse
• Voluntary Response

Multiple Choice

Source of bias that occurs when you ask people who are EASY to ask

• Response Bias
• Convenience Sampling
• Nonresponse
• Voluntary Response

Multiple Choice

A factory manufactures light bulbs. The factory currently has 300 boxes of light bulbs in its warehouse. To test the quality of bulbs, Alex decides to take out a sample of bulbs and test them to see if they work. Which surveying method will give him the least valid results?

• selecting ten boxes randomly, mixing the bulbs of these boxes together and then selecting ten bulbs randomly
• selecting ten boxes randomly and then selecting one bulb randomly from each box
• selecting one bulb randomly from every tenth box
• selecting one box randomly and then selecting all the bulbs from the box

Multiple Choice

An survey is conducted where participants are asked how frequently the wear their seat belt when they are in cars. What type of bias will the survey likely suffer from?

• Nonresponse Bias

• Voluntary Response Bias

• Undercoverage

• Response Bias

Try the back page of your notes

​For each example identify the type of bias.

Then, determine if the number they would get from this study (the statistic) is likely higher or lower than the parameter.

Now Check Your Answers

After you have tried all the examples on the back, follow the link to see how you did.

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Work on Practice 3.1 - It is due next class!