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| 1 | |
Radi needed to survey 50 students at his school for a math assignment. Each of the students has a locker numbered from 1 to 600. Radi programmed his graphing calculator to randomly generate 50 integers from 1 to 600 and used them to select the students to be interviewed. What kind of a sample is this? |
| | A) | stratified |
| | B) | systematic |
| | C) | convenience |
| | D) | random |
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| 2 | |
Saskia sent emails to all 120 people in her address book asking them if they would like to fill out a questionnaire for a school project. What kind of a sample is this? |
| | A) | systematic |
| | B) | voluntary response |
| | C) | stratified |
| | D) | random |
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| 3 | |
The student council is planning a special event for the last day of classes. A sample of students will be surveyed to determine whether they should have a sports day, band concert, movie presentation, or variety show. Which of these would be a stratified sample?
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| | A) | Select 60 students from classes attended by the members of the council. |
| | B) | Select a number of students from each grade, based on the total number in that grade at the school. |
| | C) | Select the first 60 students who enter the cafeteria on a given day. |
| | D) | Randomly tape 60 questionnaires on lockers around the school. |
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| 4 | |
A real estate office employs 20 people. A decision must be made as to where to hold the Christmas dinner. What kind of sample would be most suitable? |
| | A) | Survey the entire population. |
| | B) | Randomly select 5 employees. |
| | C) | Use a stratified sample of 5 employees. |
| | D) | Ask the first 5 employees who enter the office on a given day. |
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| 5 | |
The main intersection in a small town has two-way stop signs. The town council is contemplating spending $10 000 to install a set of stoplights. Which sample would be most likely to be free from bias? |
| | A) | Survey 100 drivers of cars that stop at the intersection. |
| | B) | Randomly select 100 homes from those in the town. |
| | C) | Survey 100 pedestrians trying to cross the street without the stop signs. |
| | D) | Survey 100 members of the local bicycle club. |
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| 6 | |
Fans at a hockey game are sitting in three cheering sections. Section A supports the home team with 120 fans. Section B supports the visiting team with 90 fans. Section C supports neither team in particular (they just like to watch hockey) with 150 fans. A stratified sample of 24 fans is to be surveyed to predict the outcome of the game. How many from Section A should be included? |
| | A) | 6 |
| | B) | 8 |
| | C) | 10 |
| | D) | 12 |
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| 7 | |
Which of the following would be best determined by sampling the entire population of a business that employs 800 people in a single building? |
| | A) | Where should the company picnic be held? |
| | B) | What colour should the main foyer be painted? |
| | C) | Are all of the phones working properly? |
| | D) | How many water coolers should be ordered for the building? |
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| 8 | |
A jar contains an unknown number of jelly beans of various colours, but none are blue. Alison added 24 blue beans, and mixed up the beans in the jar. She extracted a random sample of 30 beans and found that 4 of them were blue. Estimate the number of other coloured jelly beans in the jar.
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| | A) | 24 |
| | B) | 30 |
| | C) | 96 |
| | D) | 156 |
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| 9 | |
Sandor is considering running for mayor. He surveyed the 50 members of the soccer club he belongs to and found that 32 would vote for him. If 12 000 votes are cast in the election, how many could he expect to get? |
| | A) | Less than 7680, since his sample is likely biased in his favour. |
| | B) | 7680 |
| | C) | More than 7680, since his sample is likely biased in his favour. |
| | D) | The sample is too small to make a prediction. |
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| 10 | |
Deepa has won 3 out of every 8 games played at inter-school chess tournaments. During the round-robin playoffs, she will play 32 games. How many can she expect to win?
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| | A) | 3 |
| | B) | 8 |
| | C) | 12 |
| | D) | 16 |
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