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AP Statistics > Unit 2 > Flashcards

Unit 2 Flashcards

1
Q

What is distribution?

A

Shape, outliers, center, spread

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2
Q

What is the difference between frequency and relative frequency?

A

Frequency is the amount of counts (like to make a histogram) and relative frequency is the percentages of the whole

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3
Q

When is it better to use relative frequency?

A

When you’re working with a large data set

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4
Q

What types of graphs are appropriate for quantitative data?

A

Histograms, stem/leaf plots, dot plots, box plots

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5
Q

What is marginal distribution?

A

Takes percentages of the whole of a sample

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6
Q

What is conditional distribution?

A

Takes a percentage from only one variable of a sample

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7
Q

Do different or same calculated values imply an association?

A

Different

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8
Q

How is shape measured?

A

Symmetry, mode, skewedness

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9
Q

How is center measured?

A

Median or mean

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10
Q

How is spread measured?

A

Standard deviation, IQR, range

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11
Q

What does it mean for a value to be resistant?

A

It is not effected by outliers or extreme values

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12
Q

Which measures are resistant?

A

Median, IQR

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13
Q

What can increase the standard deviation?

A

Outliers or increased variability

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14
Q

Describe the shape if mean = median

A

Approx. normal or symmetric

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15
Q

Describe the shape if mean < median

A

Skewed left

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16
Q

Describe the shape if mean > median

A

Skewed right

17
Q

How do you find a percentile?

A

Z-scores

18
Q

Do z-scores have units?

A

No

19
Q

What does the +/- tell you?

A

Direction of deviation

20
Q

What measures change when adding/subtracting the same value to every score?

A

Median, mean

21
Q

What measures change when multiplying/dividing by the same value to every score?

A

All are increased by x

22
Q

What is the relationship between the point of inflection and standard deviation?

A

The point of inflection is where a bell curve slightly changes direction at the threshold of each standard deviation

23
Q

When do you use InvNormal( ) ?

A

When you know the percent and are working backwards o find a z-score

AP Statistics (2 decks)

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