10.7 - Measuring Variation Flashcards by Sam McGee

Q

Why is random sampling important?

A

Avoids bias

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Q

What are the steps in random sampling?

A

Generate random coordinates

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Q

What are the three types of average value?

A

Mean

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Q

How do you calculate the mean?

A

Sum of values divided by number of values

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Q

How do you calculate the median?

A

Middle value

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Q

How do you calculate the mode?

A

Most frequent value

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Q

What is a normal distribution curve?

A

Bell-shaped curve

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Q

What does standard deviation measure?

A

Spread of values around the mean

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Q

What does a small standard deviation indicate?

A

Values clustered around the mean

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Q

What does a large standard deviation indicate?

A

Values spread widely around the mean

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Q

What are error bars?

A

Visual representation of standard deviation

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Q

What does the length of an error bar indicate?

A

Degree of value spread

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Q

What is the formula for standard deviation?

A

√[Σ(x - x̄)² / (n - 1)]

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