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10 QuestionsShow answers
• Question 1
900 seconds
Q. A survey should always be ____ and ____.
answer choices
random and biased
random and unbiased
• Question 2
900 seconds
Q.

At an assembly 7 out of 10 students who entered the gym were carrying a backpack. Based on this information, if 700 students were at the assembly, how many students could be expected to be carrying a backpack?

answer choices

49

490

210

421

• Question 3
900 seconds
Q. Ana wants to know the average studentâ€™s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?
answer choices
thirty students who are often tardy
thirty students who are rarely tardy
thirty of her friends
thirty randomly selected students from her school
• Question 4
900 seconds
Q.

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

answer choices

Biased

Unbiased

• Question 5
900 seconds
Q. A sample should be
answer choices
representative of  only middle school students only
a very large group
representative of the population
representative of people who volunteer
• Question 6
900 seconds
Q.

The Student Council asked every tenth student in the lunch line how they preferred to be contacted with school news. The results are shown in the table. Is this an unbiased sample? If yes, suppose there are 684 students at the school. How many can be expected to prefer E-mail?

answer choices

No, it's a biased sample

432

304

16

• Question 7
900 seconds
Q.

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

answer choices

Biased

Unbiased

• Question 8
900 seconds
Q.

A radio station asks its listeners to dial one of two numbers to indicate their preference for one of two candidates in an upcoming election. Of the responses received, 76% favored candidate A. If there are 1,500 registered voters, how many will vote for candidate A?

answer choices

1,140

6

1,974

100

• Question 9
900 seconds
Q.

To determine the number of umbrellas the average household in the United States owns, a survey of 100 randomly selected households in Arizona is conducted. Of the households, 24 said that they own 3 or more umbrellas. The researcher concluded that 24% of the households in the United States own 3 or more umbrellas. Is the this a valid conclusion? Justify your answer.

answer choices

Valid. The sample is biased.

Not valid. The sample is biased.

Valid. The sample is unbiased.

Not valid. The sample is unbiased.

• Question 10
60 seconds
Q.

A company makes DVDs and randomly selects 25 from 1500 to test them to see if they work.

answer choices

Biased

Unbiased

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