Range and Interquartile Range

Question 1

Cheryl wants to find the number of hours seventh-graders do homework each week. There are 297 girls and boys in seventh grade. Which is the best way for Cheryl to get a representative sample without spending too much time?

Revolt · Accepted Answer

She can randomly survey 50 seventh-graders in the school.

Question 2

Which statement(s) describe her sampling method? Check all that apply.

Revolt · Accepted Answer

Her method will produce a valid sample.; Her method will produce a random sample.; Her method will produce a representative sample.

Question 3

Which gives the best definition of a representative sample?

Revolt · Accepted Answer

A sample that has the same general characteristics of the target population.

Question 4

Which of these statements are true about his sampling method? Select all that apply.

Revolt · Accepted Answer

His sample will probably be biased.; His sample will probably be invalid.

Question 5

Survey is most likely to produce a representative sample. Survey is most likely to produce a biased sample. Survey collects information on an entire population.

Revolt · Accepted Answer

Selection 1: 3; Selection 2: 2; Selection 3: 1

Question 6

suggested the best way to produce a random sample that is not biased.

Revolt · Accepted Answer

Kai

Question 7

Which of the following ideas did you include in your response? Select all that apply.

Revolt · Accepted Answer

The publisher should select a random sample of the newspapers and check them.; The publisher should check enough but not all of the papers to get a representative sample.; The publisher should be careful to select papers at random to avoid getting a biased sample.

Question 8

A newspaper publisher wants to check its daily output of about 300,000 newspapers to be sure each includes a comics section. Explain how the publisher could do this.

Revolt · Accepted Answer

The publisher should take a random sample of the newspapers to check for the comics section. Checking every single newspaper is impractical, so selecting a representative sample at random will help ensure the quality of the batch without bias.

Range and Interquartile Range Answers

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