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AP Statistics > Misc. Equations/Definitions > Flashcards

Misc. Equations/Definitions Flashcards

1
Q

Parameter

A

A measurement of a population

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2
Q

Statistic

A

A measurement of a sample

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3
Q

What does “Remember your SOCS” stand for?

A

Shape
Outliers
Center
Spread

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4
Q

How do we find the middles from a histogram?

A

∑(median of each class * frequency)/total count

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5
Q

What symbol do we use for population mean?

A

μ

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6
Q

What symbol do we use for a sample mean?

A

x̄

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7
Q

Is the mean resistant to outliers?

A

No

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8
Q

Is the median resistant to outliers?

A

Yes

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9
Q

IQR

A

Interquartile Range=Q3-Q1

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10
Q

1.5 IQR Rule

A

Possible outliers are outside the interval [Q1-1.5IQR, Q3+1.5IQR]

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11
Q

Standard Deviation

A

How far points are away from the mean, average. Distance of the data points from the mean.

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12
Q

Is there more variability in a population or a sample?

A

Sample

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13
Q

Variance

A

(Standard Deviation)^2

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14
Q

Is the standard deviation resistant to skewness?

A

No

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15
Q

Relative Frequency

A

The proportion of data to the left of a point.

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16
Q

Z-Score

A

Number of standard deviations away from the mean.

17
Q

68-95-99.7 Rule

A

In a normal distribution,

aprx. 68% of data is within one standard deviation of the mean.
aprx. 95% of data is within two standard deviations of the mean.
aprx. 99.7% of data is within three standard deviations of the mean.

18
Q

How do we transform from X(normal) to Z(std. normal)?

A

Z=(X-μ)/σ

19
Q

Explanatory Variable

A

Attempts to explain the observed outcomes or variation in the other variable.

20
Q

Response Variable

A

Measures the outcome of the study

21
Q

A statement is always…

A

y vs x / response vs explanatory

22
Q

Median Trace

A

Divide data into classes (vertical strips) of the same width, & then find the median of each class and connect the medians with segments.

AP Statistics (1 decks)

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