Statistics

Front

A survey should always be ____ and ____.

Back

random and unbiased

Front

If 700 students were at the assembly and 7 out of 10 students were carrying a backpack, how many students could be expected to be carrying a backpack?

Back

490

Front

Which group of students should Ana survey to get the most accurate opinion of the tardy policy? Options: thirty students who are often tardy, thirty students who are rarely tardy, thirty of her friends, thirty randomly selected students from her school.

Back

thirty randomly selected students from her school

Front

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

Back

Unbiased

Front

A sample should be

Back

representative of the population

Front

Is the sample unbiased? If yes, how many of 684 students can be expected to prefer E-mail?

Back

304

Front

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

Back

Biased

Front

76% of 1,500 registered voters favor candidate A. How many will vote for candidate A?

Back

1,140

Front

Is the conclusion that 24% of U.S. households own 3 or more umbrellas valid based on a survey of 100 households in Arizona?

Back

Not valid. The sample is biased.

Front

A company makes DVDs and randomly selects 25 from 1500 to test them to see if they work. Is this selection method biased or unbiased?

Back

Unbiased