Topic 6 Review - 7th Grade

A(n) _______________________ is an entire group of objects from which data can be collected.

• Inference

• population

• random sample

• sample

• valid inference

Making a conclusion by interpreting data is called making a(n) ________________________.

• Inference

• population

• random sample

• sample

• valid inference

A(n) _______________________ is one that is true about a population based on a representative sample.

• Inference

• population

• random sample

• sample

• valid inference

A(n) _______________________________ accurately reflects the characteristics of an entire population.

• Inference

• population

• random sample

• representative sample

• valid inference

Anthony opened a new store and wants to conduct a survey to determine the best store hours. Which is the best representative sample?

• A group of randomly selected people who come to the store in one week.

• A group of randomly selected people who visit his website on one night.

• Every person he meets at his health club one night.

• The first 20 people who walk into his store one day.

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? Explain.

• 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 not include people who would buy blueberry muffins but do not like cranberry muffins.

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

1) There are 400 students at Polly’s school. She surveyed a random sample of 80 students to find their favorite hobby

· 19 said they like to read

· 30 said they like to be with friends

· 8 said they like to do crafts

· 23 said they like to play sports.

Make an inference from the data.

• Doing crafts is the least popular hobby at Polly’s school.

• Reading is about ½ as much as students like to hang with friends.

• Being with friends was the most popular hobby at Polly’s school.

• About 25% of the students like to play sports.

• About 80% of students prefer to read as a hobby.

The two data sets show the number of days that team members trained before a 5K race.

What inference can you draw by comparing the medians?

• Team B members generally trained for more days than Team A members.

• Team A members generally trained for more days than Team B members.

• Team B members generally trained for less days than Team A members.

• Team A members generally trained for less days than Team B members.

The two data sets show the number of days that team members trained before a 5K race.

What inference can you draw by comparing the interquartile ranges?

• There is more variability in the number of days that Team A members trained because the IQR for Team A is greater than the IQR for Team B

• There is less variability in the number of days that Team A members trained because the IQR for Team A is greater than the IQR for Team B

• There is more variability in the number of days that Team B members trained because the IQR for Team B is greater than the IQR for Team A