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- Multiple ChoicePlease save your changes before editing any questions.A survey should always be ____ and ____.random and biasedrandom and unbiased
- Multiple ChoicePlease save your changes before editing any questions.
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?
49
490
210
421
- Multiple ChoicePlease save your changes before editing any questions.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?thirty students who are often tardythirty students who are rarely tardythirty of her friendsthirty randomly selected students from her school
- Multiple ChoicePlease save your changes before editing any questions.
A public library asked every 10th person who entered to name the type of book they were getting
Biased
Unbiased
- Multiple ChoicePlease save your changes before editing any questions.A sample should berepresentative of only middle school students onlya very large grouprepresentative of the populationrepresentative of people who volunteer
- Multiple ChoicePlease save your changes before editing any questions.
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?
No, it's a biased sample
432
304
16
- Multiple ChoicePlease save your changes before editing any questions.
A hospital wants to open a gym. They ask the night-shift ER staff when they would use the gym.
Biased
Unbiased
- Multiple ChoicePlease save your changes before editing any questions.
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?
1,140
6
1,974
100
- Multiple ChoicePlease save your changes before editing any questions.
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.
Valid. The sample is biased.
Not valid. The sample is biased.
Valid. The sample is unbiased.
Not valid. The sample is unbiased.
- Multiple ChoicePlease save your changes before editing any questions.
A company makes DVDs and randomly selects 25 from 1500 to test them to see if they work.
Biased
Unbiased