Random Sampling and Representative Samples

6. 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

9. Mrs. Croix is conducting a survey to find out the favorite snack of fifth and sixth graders. She will ask a sample of 100 students. Which of the groups below should be surveyed to get the BEST representative sample?

• A. 20 students from each of the 5 local fifth- and sixth-grade schools.
• B. The first 100 students who go to a local baseball game

_______ is a part of a group being surveyed.

• Sample
• Population
• Random Sample
• Quartile

A student wants to know which type of pizza the students at his high school prefer. Which option would give a unbiased, representative sample:

• Asking all the students in the hot lunch line.
• Asking 10 random students from each homeroom.
• Asking every other student who gets off a school bus.
• Asking all the 10th graders.

A student surveys mathematics teachers to get their opinion on teaching.  What is the sample?

• All teachers in the world.
• All teachers within the school.
• All mathematics  teachers in the school.
• All teachers except mathematics teachers.

A scientist studies a herd of mule deer to learn about their dietary habits. Identify the population.

• All animals

• Mule deer

• Deer

• Mules

A computer manufacturer surveys its customers who purchased laptop computers to ask what software the company should include with its computer.  Identify the population.

• Customers who purchased laptop computers.
• Customers of the store.
• Customers who are interested in software.
• Computer manufacturers

Teddy did a random sample of 20 7th grade students and concluded that 59% of the students ate ala cart yesterday. If there are 183 kids in the class, about how many ate ala cart?

• 108

• 107

• 9

• 18

Emily did a random sample of 7th grade students and concluded that 27% of the class spends their money on clothes. If there are 183 7th graders, how many spend their money on clothes?

• 49

• 50

• 48

• 29

Drew did a random sampling survey of the 7th grade and concluded that 95% of the class has a cell phone. If there are 183 kids in the class, about how many do not have a cell phone?

• 10

• 9

• 173

• 174