Review Unit 5 Y08 Math

Which survey is NOT a census survey?

• a. To find out if a new burger tastes good, a burger store asks every customer in the store

  to try a sample of the new product.

• b. To find out the area from where most customers come, a store asks for the postal code of

  every customer.

• c. To find out how many students are interested in a school dance, all students in the school

  who are interested are asked to sign up.

• d. To find out if the service provided is satisfactory, every customer in a coffee shop is

  surveyed.

Data are collected on the number of students in Grade 8 who own a calculator.

Which method collects primary data from a sample?

• a. Every third student in Grade 8 is asked if he/she owns a calculator.

• b. Every Grade 8 teacher asks 5 students in her/his class if they own a calculator.

• c. Every Grade 8 teacher asks all their students if they own a calculator.

• d. Every student in Grade 8 is asked if he/she owns a calculator.

Data are collected on the number of students in Grade 8 who own a calculator.

Which method collects primary data from a census?

• a. Every Grade 8 teacher asks all their students if they own a calculator.

• b. Every third student in Grade 8 is asked if he/she owns a calculator.

• c. Every student in Grade 8 is asked if he/she owns a calculator.

You want to find out the favourite subjects of the students at your school.

Which survey method will give the most reliable results?

• a. Interview every tenth student leaving an all-school assembly.

• b. Interview students leaving a classroom.

• c. Interview a group of students on their way to the library.

• d. Interview a group of students standing in the hallway.

Raisa wants to collect data on how teenagers like to spend the Saturday afternoon.

Which survey method will provide Raisa with the most reliable data?

• a. Interview teenagers in a local library.

• b. Interview teenagers at a sports centre.

• c. Interview teenagers at the school during the week.

• d. Interview teenagers at a shopping mall.

A survey will be conducted on the studying habits of the Grade 8 students in a school.

There are 45 boys and 30 girls in Grade 8.

Which survey method will provide the most reliable information?

• a. Interview a selected sample of 10 boys and 10 girls from Grade 8.

• b. Interview a random sample of 75 students from the school.

• c. Interview a random sample of 25 students from Grade 8.

• d. Interview a random sample of 15 boys and 10 girls from Grade 8.

You want to poll students about conditions on the bus they take to your school.

Which survey method will provide the most reliable information?

• a. Survey the same number of students randomly selected from each bus that transports

  students to school.

• b. Survey the same number of students randomly selected from each grade.

• c. Survey every fifth student who enters the school.

• d. All of the above

Which sampling method might give biased data?

• a. Listeners calling in to a radio station are asked if they prefer country or classic music.

• b. An equal number of boys and girls in a school are randomly surveyed to find out if the

  students prefer carpet of hardwood floors in their new school library.

• c. A phone company calls 6 names at random from the phone book to find out if the person

  is satisfied with the phone service.

• d. Every sixth person leaving a restaurant is surveyed to determine the most popular food

  item in the restaurant’s menu.

To find the average income of an adult in Ontario, 250 workers in Toronto are surveyed.

Would this be a good sample? Explain.

• a. No; the sample is not selected from the population studied.

• b. Yes; the sample is selected at random.

• c. Yes; the sample is selected from the population studied.

• d. No; the sample is not random.

To find the average age of drivers in a city, all the names of people in the city with a driver’s licence are

entered into a file. One hundred names are randomly picked from the file to use as a sample.

Would this be a representative sample? Explain.

• a. No; the sample is not random.

• b. Yes; the sample represents all drivers in the city.

• c. Yes; the sample is selected at random from the population studied.

• d. No; the sample is not selected from the population studied.