Inferencing Proportions Quick Check

1. A sample in which every person, object, or event has an equal chance of being selected.

• A. Random sample.
• B. Biased sample.

2. When a sample does not accurately represent the population it is a:

• A. Unbiased sample
• B. Biased sample

Carlos wants to know the favorite sport of people at his school so he asks his baseball team.

• A. Biased

• B. Unbiased

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?

• A. Thirty randomly selected students from her school

• B. Thirty students who are rarely tardy

• thirty of her friends

At a middle school, the 7th graders will conduct a survey for where to go on a field trip.

Which method will result in the least biased decision?

• A. To randomly ask 8th grade students who went on a field trip last year.

• B. To randomly choose some 7th grade students to select a location.

On a quiz show, a contestant correctly answered 9 of the last 12 questions Suppose the contestant continues on the show and tries to correctly answer 24 questions. About how many questions would you predict the contestant to correctly answer?

• 81

• 18

• 12

• 24

If 3 out of 24 students surveyed said their least favorite chore was cleaning their room, how many would say that out of 528 students

• 24

• 528

• 66

• 87

If 5 out of 24 students surveyed said their least favorite chore was dusting, how many would say that out of 528 students

• 66

• 110

• 24

• 86

A Target survey found that 4 out of 5 customers who entered the store made a purchase. If this store recorded 22,853 purchases last week, estimate the number of customers who entered the store.

• 28,566

• 18,282

• 50,784

• 10,284

A survey found that 8 out of 12 fans at the Falcons stadium made a purchase on food while at the game. If the crowd recorded 60,000 people at the game, estimate the number of fans who purchased food.

• 42,000

• 40,000

• 45,000

• 48,000