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AP Statistics > Chapter 5 > Flashcards

Chapter 5 Flashcards

0
Q

Legitimate values of r is between

A

-1 and 1

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1
Q

What is correlation coefficient

A

A quantities assessment of the strength and direction of the linear relation between bi arise quantitive data

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2
Q

If correlation coefficient is zero

r=0 what does it mean

A

Means no correlation

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3
Q

If correlation coefficient is between zero and .5

Means

A

It is a weak correlation

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4
Q

I correlation coefficient is between point .5 and .8 it means

A

There is a moderate relation ship

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5
Q

If correlation coefficient is between.8-1

It means

A

It has a strong relationship

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6
Q

Correlation does not imply

A

Causation

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7
Q

To interpret correlation coefficient you use

A 
Strength (none, weak, moderate, strong)
Direction (negative, positive)
Linear reflation ship
Between 
X and Y
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8
Q

What is a residual

A

Vertical deviation between observation and regression line

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9
Q

Sum of the residuals equal

A

Zero

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10
Q

Residuals equals

A

Observed (Y) - expected ( Y hat)

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11
Q

If there is a pattern on a residual graph it means

A

It is not linear

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12
Q

If a residual graph is random with no pattern it means

A

That the graph is linear

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13
Q

What is r squared?

A

It is the coefficient of determination

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14
Q

What is the coefficient of determination?

A

It is r squared

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15
Q

Interpretation of r^2

A

Approximately r^2 % of the variation in y can be explained by the LSRL of x and y

16
Q

What is an influential point

A

A point that influences where the LSRL is located

17
Q

What happens I the influential point of a graph is removed?

A

It will significantly change the slope of the LSRL

18
Q

Is LSRL effected by an outlier

A

Yes

19
Q

Is correlation coefficient r resistant to outliers?

A

No

20
Q

Is the coefficient of determination effected by an outlier

A

Yes

21
Q

Least squares regression line LSRL is

A

A line that gives the line of best fit and it minimizes the sum of the squares of deviation from the line

22
Q

Slope interpretation

A

For each unit intense in x there is an approximate increase/decreases of b in y

23
Q

What happens to r ( the correlation coefficient ) when you do anything to the variables?

A

R the coefficient correlation does not change

24
Q

The natural log (ln) is equal to

A

Log e

25
Q

Normal log (log) is equal to

A

Log 10

AP Statistics (9 decks)

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