Samples Surveys and Inferences

Group A and Group B were randomly sampled from the same population. Select all the inferences that you can make.

• Group B has a higher median than Group A.

• Group B has a higher mean than Group A.

• Group B has more overall variability than Group A.

• Group B has a smaller range than Group A.

• Group A and B have the same maximum value.

If you compare the medians of each data set, who spends more time online?

• Seventh graders

• Eighth graders

• Both grades spend an equal amount of time online.

• Impossible to determine from the data sets.

_______ is a part of a group being surveyed.

• Sample

• Population

• Quartile

• Random Sample

The Magic Kingdom theme park has many attractions, one of which is Space Mountain. Are the people who ride Space Mountain the population, or a sample, of the theme park? Explain.

• Population. They are all the people at the theme park.

• Sample. They are a subset of all the people at the theme park.

• Both population and sample. They are all the people at the theme park

• Neither population nor sample. They are not the people at the theme park.

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

• Sample

• Quartile

• Random Sample

• Population

Becky wants to know if she should sell cranberry muffins at her bakery. She asks every customer who buys blueberry muffins if they would buy cranberry muffins. Is this a representative sample?

• Yes, it does not include people who would buy cranberry muffins but do not like blueberry muffins

• No, it does not include people who would buy cranberry muffins but do not like blueberry muffins

• Yes, it does include people who would buy cranberry muffins but do not like blueberry muffins

• No, it does include people who would buy cranberry muffins but do not like blueberry muffins

_______ is a part of a group being surveyed.

• Sample

• Population

• Random Sample

• Quartile

Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?

• Thirty randomly selected students from her school

• Thirty students who are rarely tardy

• thirty of her friends

A school surveys all 7th grade boys to determine what to sell in the school store.  This sample is _________.

• Biased

• Unbiased

• Representative

• Peanut butter cups

A school survey asked 50 girls to identify their favorite items on the school cafeteria menu. This sample is _________________.

• Biased

• Unbiased

• Representative

• Numerical