Inference Vocabulary

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 (valid)?

• thirty students who are often tardy

• thirty students who are rarely tardy

• thirty of her friends

• thirty randomly selected students from her school

What are ALL the terms used for unbiased? There is more than one answer.

• fair

• invalid

• valid

• unfair

• conclusive

3.  A hospital wants to open a gym. They ask the night-shift ER staff when they would use the gym.

• Biased
• Unbiased

Define sample.

• part of a group

• part of a population

• always larger than the population

• none of the above

What are ALL the terms used for biased sample

• unfair

• fair

• valid

• invalid

• inconclusive

Define population.

• Part of a population

• A population can be any group that is appropriate for a particular situation.

7. A public library asked every 10th person who entered to name the type of book they were getting.

• Biased/Convenience

• Unbiased/Systematic Random Sample

• Biased/Voluntary Sample

• Unbiased/Simple Random Sample

What are the 5 number summary of a box and whisker plot?

• mode, median, range, mean, IQR

• minimum, first quartile, median, third quartile, and maximum,

• IQR, mean, minimum, maximum, and mode

• Only mode, median, and minimum

Identify the Sample:
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
• All customers
• 8 customers
• Dessert

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

A sample should be

• representative of only middle school students

• a very large group

• representative of the population

• representative of people who volunteer