Inference and Sampling Questions

Maria takes out 10 candies and finds that 4 are red. What can be inferred?

• Exactly 4 out of 10 are red

• Probably the jar has around 40% red candies

• All the candies in the jar are red

• Nothing can be said

A die rolls a 6 twenty times out of 60. What can be inferred?

• It always rolls sixes

• Probably fair

• Could be unfair

• More than 6 sides

Which of the following is a sample?

• All the students in your school

• All the books in the library

• 20 random students from the school

• Every apple in the grocery store

Emma only surveys her soccer team about their favorite sport. What is the problem?

• She asked too many people

• She did not ask the teachers

• The sample is biased

• She did not use a survey

30 out of 50 students like pizza. What can you infer?

• No one likes pizza

• 60% might like pizza

• 30 students like pizza

• Exactly 60 like pizza

What is the best sample for the favorite subject?

• Students from the art club

• Students in math class

• 30 random students from all grades

• Students from the science class

Why do we use samples?

• A. Faster and easier

• B. Only way to get an exact answer

• C. Samples are more accurate

• D. You don't need math for samples

75 out of every 100 plants grow tall with sunlight. Inference?

• All plants grow tall

• Water is bad

• They usually grow taller with sunlight

• Sunlight stops growth

Which gives the least reliable inference?

• Sample of 2 people

• Sample of 100 people

• Sample of 500 people

• Sample of 50 people

Why does a company survey 1,000 people about a soda?

• To give away free drinks

• To guess what all customers think

• To sell more sodas

• Not knowing what to do with the soda