Intro to Inferences

How do you find the mean of a data set?

• Add all the values then divide the total by the number of values.

• Add all the values then divide by 2.

• Multiply and divide all the values.

• Order the values from least to greatest and divide them.

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The average of a data set is also known as the

• Mode

• Median

• Mean

• Range

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What is the middle value in a data set that has been ordered from least to greatest?

• Mode

• Median

• Mean

• Q1

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What is the values or numbers that occurs the most in a data set?

• Median

• Mode

• Mean

• Maximum

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How is the range calculated?

• Subtract Q1 from Q3?

• Add the minimum and maximum values

• Divide the minimum and maximum values

• Subtract the minimum value from the maximum value.

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1. A sample in which every person, object, or event has an equal chance of being selected.

• A. Random sample.
• B. Biased sample.

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2. When a sample does not accurately represent the population it is a:

• A. Unbiased sample
• B. Biased sample

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4.  Carlos wants to know the favorite sport of people at his school so he asks his baseball team.

• A. Biased
• B. Unbiased

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

• Biased
• Unbiased

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6. 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?

• A. Thirty randomly selected students from her school
• B. Thirty students who are rarely tardy
• thirty of her friends

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